Lucia de Berk case

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De Berk prior to her imprisonment Lucia post.jpg
De Berk prior to her imprisonment

The Lucia de Berk case was a miscarriage of justice in the Netherlands in which a Dutch licensed paediatric nurse was wrongfully convicted of murder. In 2003, Lucia de Berk was sentenced to life imprisonment, for which no parole is possible under Dutch law, [1] for four murders and three attempted murders of patients under her care. In 2004, after an appeal, she was convicted of seven murders and three attempted murders.

Contents

Her conviction was controversial in the media and among scientists, and it was questioned by the investigative reporter Peter R. de Vries. In October 2008, the case was reopened by the Dutch Supreme Court, as new facts had been uncovered that undermined the previous verdicts. De Berk was freed, and her case retried; she was exonerated in April 2010. [2] [3]

Suspicions and investigation

Colleagues started to notice that patients often died under de Berk's watch. Suspicions were raised when a five-month-old baby turned blue and died unexpectedly, only an hour after doctors had said that her condition was improving. [4] [5] Other colleagues requested an investigation. [5] A post-mortem on the child indicated foul play. [4]

Police investigators looked into all the deaths that had occurred between 1997 and 2001 while de Berk was working at three hospitals in The Hague: the Juliana Children's Hospital  [ nl ], the Red Cross Hospital  [ nl ], and the Leyenburg Hospital  [ nl ]. In a few cases, evidence of poisoning through tranquilizer overdose was found, although in most cases no firm explanations could be found for the deaths. [5]

Lucia de Berk was charged with killing thirteen patients and attempting to kill five others by injecting them with tranquilizers, painkillers and potassium. The alleged victims included four babies, several toddlers and some elderly persons. [5]

Trial

De Berk's trial began in September 2002. Amongst the other evidence used against her were diary entries that the prosecution asserted showed that she was "obsessed by death". [5] It was revealed that she had tried to burn these diaries to destroy them at the start of the investigation. [6] A toxicologist, an FBI profiler and a statistician were also called by the prosecution as evidence. [7] Another key piece of the evidence was traces of poisonous toxins found in the blood of three children she had been alleged to have killed, who had been exhumed as part of the investigation. [4] [8] Tests on the body of the five-month-old baby whose death had led to the initial suspicions of de Berk indicated that the baby had been poisoned. [6] It was also noted that police had found books about crimes and murders in her home, such as Bad Blood: the Thanatos Syndrome Serial Murderer and Corpus Delicti: the 30 Most Notorious Crimes of the Low Countries. [5] De Berk admitted that she had stolen these from the hospital library. [7] [9] The prosecution also highlighted the fact that she had forged a Canadian diploma in order to qualify for medical training, and de Berk also faced further charges for this falsification of records and the book thefts. [7] [5] De Berk admitted during the trial that she had lied about her nursing credentials and had stolen the books as well as medicine and patient files. [9]

The prosecution argued that she had killed or attempted to kill patients by unnecessarily increasing dosages of medicines, or giving large doses of drugs that are difficult to detect. One of the trial judges noted that the cases in question seemed to follow a particular pattern, saying: "Lucia says she believes she sees a problem and starts to alert colleagues and soon enough a crisis occurs, did you perhaps raise the alarm first so that you could then introduce death?". [5]

De Berk denied the charges, blaming the deaths and near-deaths on other staff in the hospitals or the quality of medical equipment. [7] She said that the diary entries had been misinterpreted and taken out of context, and that the "compulsion" she had said she had given in to was actually her love for laying out Tarot cards for ill patients. [5] One of the victims, a six-year-old Afghan boy, had died from a lethal dose of a sleeping medication; de Berk testified to the court "of course it's strange, but I don't know how it happened". [7] Her defence argued that she was only more often present at deaths because she had a lot of concern for her patients. [10]

During the trial proceedings were adjourned as de Berk was sent by the court for psychiatric tests at the Netherlands forensic psychiatric assessment centre, where she was found to have a personality disorder but to be completely responsible for her actions. [10] De Berk had previously refused requests to undergo psychiatric tests. [9] When a psychologist testified at the trial that de Berk was "theatrical, narcissistic, aggressive and suffering from a personality disorder", de Berk replied: "that sounds like me". [6]

In March 2003 de Berk was found guilty of the murder of four of the individuals and the attempted murder of three others. [11] In every one of the cases de Berk was responsible for their care and medication, or was the last person present before they died or declined. [10] Of these those that died it was concluded that they had been given an overdose of either potassium or morphine, and in each of the cases de Berk was the last person to be at the patients' bedside. [11] In all seven cases where she was found guilty there was no possible medical explanation. [10]

In two cases, the court concluded that there was proof that de Berk had poisoned the patients. Concerning the other cases the judges considered that they could not be explained medically and must have been caused by de Berk, who was present on all of those occasions. The idea that only weaker evidence was needed for the subsequent murders after two had been proven beyond reasonable doubt, dubbed chain-link proof by the prosecution, was accepted by the court. [12] : §7 

The very high digoxin levels in autopsy blood from one child were key to the argument. Digoxin had previously been administered to the child, but the treatment had been discontinued some time before and doctors argued there should be none remaining. There was a brief period when the child had been disconnected from monitors approximately an hour before death, which would have been the time when a lethal overdose of the drug would have needed to be administered. This, the prosecution argued, gave means and opportunity to murder the child. [12] : §7 

De Berk was jailed for life. Her lawyer quickly said that she would appeal, claiming that her conviction had been based only on circumstantial evidence. [11] The media reported her diary entries as being the key evidence in her conviction. [13] [11]

Further convictions and appeals

In 2004, de Berk's first appeal failed [14] when the Court of Appeal upheld her conviction, and then convicted her of three additional murders. [15] [16] At the 2004 trial, besides a life sentence, de Berk also received detention with coerced psychiatric treatment, despite the state criminal psychological observation unit finding no evidence of mental illness. [12] A second appeal also failed when the Dutch Supreme Court upheld her conviction in 2006. [16] [14]

Doubts

One of the various pieces of evidence against de Berk at the original trial had been the testimony of a statistician, who said that the odds that it was a coincidence that all the incidents occurred when she was on duty were 342 million to one. [16] Doubts were raised about de Berk's conviction when this claim was criticised. [17] However, the appeals court still upheld the conviction on this and the other evidence. [17]

The philosopher of science Ton Derksen, aided by his sister, the geriatrician Metta de Noo-Derksen, wrote the Dutch book Lucia de B. Reconstructie van een gerechtelijke dwaling (Lucia de B: Reconstruction of a Miscarriage of Justice). [18] They doubted the reasoning that was used by the court and the medical and statistical evidence that was presented. [19]

The prosecution initially charged de Berk with causing 13 deaths or medical emergencies. In court, the defence showed that de Berk could not have been involved at all in several of the cases. For instance, she had been away for several days, but administrative errors had caused her absence on those days to be overlooked. Also, all the deaths except the last had been registered as natural. Even that one had initially been thought to be natural by the doctors responsible for the child, but had been reclassified as an unnatural death within a day after other hospital authorities associated it with de Berk and her repeated presence at recent incidents. [12] : §7 

Statistical arguments

Hospital
and ward		Juliana
Children's
Hospital		Red Cross
Hospital,
ward 41		Red Cross
Hospital,
ward 42
Total shifts1029336339
de Berk's shifts1421 *58
Incidents8514
Incidents during
de Berk's shift(s)		815
Statistics in report presented at trial [20]
* Later found to be 3 [21]

In a 2003 television special of NOVA , a Dutch professor of criminal law, Theo de Roos, stated, "In the Lucia de B. case statistical evidence has been of enormous importance. I do not see how one could have come to a conviction without it". [22]

Statistician Richard D. Gill became involved in the case in 2006. [23] Gill and Piet Groeneboom then showed that there was a chance of 1 in 25 that a nurse could experience a sequence of events of the same type as de Berk. [20] [ better source needed ] Philip Dawid, Professor of Statistics at the University of Cambridge, also criticised the prosecution's statistical evidence as unprofessional and resting on "calculations of a very simplistic nature, based on very simple and unrealistic assumptions". [24]

The use of probability arguments in the de Berk case was discussed in a 2007 Nature article by Mark Buchanan. He wrote:

The court needs to weigh up two different explanations: murder or coincidence. The argument that the deaths were unlikely to have occurred by chance (whether 1 in 48 or 1 in 342 million) is not that meaningful on its own — for instance, the probability that ten murders would occur in the same hospital might be even more unlikely. What matters is the relative likelihood of the two explanations. However, the court was given an estimate for only the first scenario. [25]

In addition to errors in the analysis, concerns were raised about the data provided by one of the hospitals, which appeared to show that De Berk was present at every single significant incident where reanimation (successful or not) was required. As a certain number of such cases are expected in all hospitals, there was reason to doubt the data provided, and later analysis after De Berk's acquittal showed that indeed, not all incidents were reported, and some cases attributed to her occurred when she was not present, had already left or was absent due to illness. [26] : 128 

At the initiative of Gill, a petition for a reopening of the de Berk case was started. On 2 November 2007, the signatures were presented to the Minister of Justice, Ernst Hirsch Ballin, and the State Secretary of Justice, Nebahat Albayrak. Over 1300 people signed the petition. [27]

Case reopened

On 17 June 2008, the Advocate-General of the Supreme Court, G. Knigge, made a request for the Supreme Court to reopen the case. On 7 October 2008, the court acceded to his request by acknowledging that new facts uncovered by Knigge substantially undermined the earlier evidence. [28]

In addition to the statistical arguments, at the third appeal hearing doubt was cast on the evidence about high digoxin levels in one child's blood, which had played a major role in de Berk's second conviction and life sentence for murder at the 2004 appeal hearings. Digoxin levels in autopsy blood should be expected to be much higher than those in a living patient. Living heart cells extract digoxin from the blood and concentrate it, but heart cells die within minutes after death and so digoxin can then diffuse into the blood in the heart and in the surrounding large blood vessels, the sites from which blood is extracted by pathologists for blood chemistry analysis. Additionally, the blood taken from the child for analysis did not originate from a proper sample but was squeezed out of a piece of gauze left inside the body after two autopsies had disturbed all of the organs. Digoxin levels increase with the evaporation of liquid. The measurement of digoxin was also complicated by the presence of digoxin-like immunoreactive substances (DLIS), which occur naturally particularly in infants. The tests used to determine the presence of digoxin were not able to distinguish between digoxin and DLIS. A laboratory in Strasbourg, with the facility to distinguish between digoxin and DLIS, analysed the samples and found 7 milligrams of digoxin per litre, a level below the threshold that would indicate poisoning. Other medical findings also failed to show any evidence of poisoning, such as the non-contraction of the heart. [12] : §7 

It was also shown that the evidence of opportunity to poison the child with digoxin was flawed. The monitor had been disconnected at 1:20 for 28 minutes, but a doctor's examination was recorded at 1:00. Analysis of the log sheet of examinations showed that they were always recorded on the hour or the half hour. A reconstruction of events showed that the disconnection would therefore have been for the examination itself, logged at 1:00 but taking place shortly after the hour. Digoxin kills within an hour, and so would have needed to be administered during that examination. [12] : §7 

In December 2009, with new statistical analysis and medical evidence having been presented, the court accepted that the deaths had all been entirely natural. [12] : §7  The appeal hearing ended on 17 March 2010. Witnesses heard on the final day stated that the deaths at the Juliana Children's Hospital were natural and were sometimes caused by wrong treatment or bad hospital management and sometimes resulted from faulty medical diagnosis. The behaviour of the nurses, including de Berk, during a couple of medical crises turned out to have been swift and effective and to have saved lives on several occasions. The Public Prosecution capitulated by formally requesting the court to deliver a not guilty verdict, which occurred on 14 April 2010. [12] : §7 

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References

  1. ↑ More Dutch prisoners serving life without parole Archived 25 September 2015 at the Wayback Machine , Barbara Rijlaarsdam, NRC Handelsblad, 22 November 2009
  2. ↑ "Nurse Lucia de Berk finally found not guilty of murdering seven patients". 14 April 2010. Archived from the original on 24 July 2011.
  3. ↑ "Apology for nurse jailed for murdering seven patients", AP, The Independent 14 April 2010.
  4. 1 2 3 "Dutch nurse denies patient murders". BBC News. 17 September 2002. Retrieved 1 October 2023.
  5. 1 2 3 4 5 6 7 8 9 "Court to Rule on Dutch Nurse Accused in 13 Deaths". New York Times. 8 October 2002. Retrieved 1 October 2023.
  6. 1 2 3 Sage, Adam (25 March 2003). "Life for nurse who murdered babies". The Times.
  7. 1 2 3 4 5 "Dutch nurse denies killing 13 patients in 'angel of death' case". The Independent. 18 September 2002. Retrieved 1 October 2023.
  8. ↑ "Dutch nurse accused of 14 murders". BBC News. 8 May 2002. Retrieved 1 October 2023.
  9. 1 2 3 "New inquiry into Dutch 'killer' nurse". BBC News. 8 October 2002. Retrieved 1 October 2023.
  10. 1 2 3 4 Sheldon, Tony (29 March 2003). "Nurse sentenced to life for murdering four patients". British Medical Journal. 326 (7391): 680. doi:10.1136/bmj.326.7391.680/b. PMC   1169320 . PMID   12663401.
  11. 1 2 3 4 "Dutch nurse gets life for murdering four patients". The Guardian. 25 March 2003. Retrieved 1 October 2023.
  12. 1 2 3 4 5 6 7 8 Schneps, Leila; Colmez, Coralie (2013). Math on trial: how numbers get used and abused in the courtroom. New York: Basic Books. ISBN   9780465032921.
  13. ↑ "Life sentence for hospital killer damned by her diary". Sydney Morning Herald. 26 March 2003. Retrieved 1 October 2023.
  14. 1 2 "Justice Flunks Math". New York Times. 26 March 2013. Retrieved 2 October 2023.
  15. ↑ Jeffrey S., Rosenthal (2015). "Probability, Justice, and the Risk of Wrongful Conviction". The Mathematics Enthusiast. 12 (1).
  16. 1 2 3 "Dutch nurse Lucy De Berk acquitted of patient murders". BBC News. 14 April 2010. Retrieved 1 October 2023.
  17. 1 2 "Court clears Dutch nurse jailed for murdering patients". The Guardian. 14 April 2010. Retrieved 1 October 2023.
  18. ↑ Ton Derksen (2006). Lucia de B. Reconstructie van een gerechtelijke dwaling. Veen Magazines BV. ISBN   90-8571-048-0. Archived from the original on 4 October 2008.
  19. ↑ The Fabrication of Facts: The Lure of the Incredible Coincidence, Ton Derksen and Monica Meijsing. pp. 39-70 in: Legal Evidence and Proof, H. Kaptein, H. Prakken and B. Verheij (eds), Ashgate, 2009, ISBN   978-0-7546-7620-1
  20. 1 2 Gill, Richard D.; Groeneboom, Piet; de Jong, Peter (2 October 2018). "Elementary Statistics on Trial—The Case of Lucia de Berk". CHANCE. 31 (4): 9–15. arXiv: 1009.0802 . doi:10.1080/09332480.2018.1549809. S2CID   5245768.
  21. ↑ Meester, R.; Collins, M.; Gill, R.; Van Lambalgen, M. (2007). "On the (Ab)use of statistics in the legal case against the nurse Lucia de B". Law, Probability and Risk. 5 (3–4): 233–250. arXiv: math/0607340 . doi: 10.1093/lpr/mgm003 .
  22. ↑ Statistiek in het strafproces Archived 9 April 2008 at the Wayback Machine NOVA/Den Haag Vandaag, 4 November 2003
  23. ↑ "Unlucky Numbers: Richard Gill is fighting the shoddy statistics that put nurses in prison for serial murder". Science. 19 January 2023. Retrieved 1 October 2023.
  24. ↑ "Expert on the most important proof in the Lucia de B. case: 'This baby has not been poisoned'". Archived 4 October 2008 at the Wayback Machine NOVA. 29 September 2007.
  25. ↑ Mark Buchanan (18 January 2007). "Statistics: conviction by numbers" (PDF). Nature. 445 (7125): 254–255. Bibcode:2007Natur.445..254B. doi: 10.1038/445254a . PMID   17230166.
  26. ↑ Meester, Ronald; Slooten, Klaas (2021). Probability and Forensic Evidence: Theory, Philosophy, and Applications. Cambridge University Press. ISBN   978-1-108-42827-9.
  27. ↑ Persbericht CWI Archived 8 April 2008 at the Wayback Machine Petitie 2 November 2007
  28. ↑ NRC "New trial for nurse convicted of seven killings" 7 October 2008

Sources

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