Biohazardsymbol

For drugs of abuse testing using urine samples, it is essential that the donor/athlete/sportsperson identifies the sample and that the urine cup is sealed (preferably by themselves). The chain of custody forms should then be signed by the donor/athlete, followed by the person who collected the specimen. In the case of an insentient patient in the emergency room, the nurse who collects the urine/blood sample can identify it in the patient's place. A related illustration depicted at the "American Association for Clinical Chemistry"- Clinical Laboratory News by Professor Amitava Dasgupta is as follows: "Police officer Ramsey seizes the urine sample collected from the suspect, and police officer Fred transports the sample to the forensic/drug testing laboratory. At the laboratory, case-receiving staff Paul receives the sample, and scientist Derek analyzes it and detects a metabolite of a banned substance/drug. Scientist Derek gives the result to principal scientist Evan, who confirms the result." Ramsey, Fred, Paul, Derek, and Evan must sign the chain of custody form sequentially. Each one of them would be required to testify to recognize and establish the condition of the sample while in their custody while maintaining the chain, which eventually proves that the suspect abused the banned substance.

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The chain of custody proves the integrity of a piece of evidence.[1] A paper trail is maintained so that the persons who had charge of the evidence at any given time can be known quickly and summoned to testify during the trial if required. A record of the chain of evidence must be maintained and established in the court whenever presenting evidence as an exhibit.[2] Otherwise, the evidence may be inadmissible in the court, leading to serious questions regarding its legitimacy, integrity, and the examination it is rendered.[3] The chain of custody needs to document every transmission from the moment the evidence is collected, from 1 person to another, to establish that nobody else could have accessed or possessed that evidence without authorization. Although there is no limit on the number of transfers, keeping this number as low as possible is crucial.

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Maintaining the chain of custody is critical in forensic practice.[5] This documentation step is vital because everything done to examine and analyze the evidentiary sample must be authorized and recorded. The liability for the condition rests with everyone coming in contact with it. The documentation should be comprehensive with information regarding the circumstances of evidence collection, the people who handled the evidence, the period of the guardianship of evidence, safekeeping conditions while handling or storing the evidence, and how evidence is handed over to subsequent custodians every time a transfer occurs (along with the signs of individuals involved at the respective stage). It prevents police officers and other labs/law officials from tainting the evidence or misplacing the piece of evidence as it would eventually be traceable back to them, and they would be held responsible for it.[6]

The documentation of the chain of custody serves 3 primary purposes: to ask relevant questions regarding the evidence to the analytical laboratory, to maintain a record of the chain of custody, and to document that the sample/evidence was handled only by approved personnel and was not accessible for tampering before analysis. The investigator or the person responsible for collecting evidence must complete the labels of the sample container/bags and the chain of custody forms to enable the sample to be tracked. Each sample container label must receive a unique identification code and other relevant information such as location, date and time of collection, the name and signature of the person who collected the sample, and the signature of the witness(es). It is vital that the evidence is appropriately packed to avoid damage during transport and must be preferably sealed in tamper-evident/resistant bags or with tamper-evident tapes.

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Each time the charge of evidence is changed, the chain of custody form requires an entry of signature, date, and time. A sample shall be deemed to be in custody if it is in the authorized custodian's actual physical possession in a secured place without access to unauthorized personnel or any opportunity for tampering. An illustration of the chain of custody in the case of the recovery of a blood-stained flat iron rod at the scene of a murder depicted in the routine text is as follows: "Investigating officer Steve collects the iron rod, packs it, and hands it to forensic analyst Jack. Forensic analyst Jack analyses the iron rod at the laboratory and collects fingerprints and blood from the iron rod. Jack then hands over the iron rod and all the collected evidence from the iron rod to the evidence-receiving clerk, Tom. The evidence-receiving clerk, Tom, then stores the evidence in the evidence storage locker. Tom records all those who have accessed the original evidence." During the trial, if the defense counsel raises queries on the chain of evidence, the records demonstrate that the iron rod in the evidence storage is the same as that collected from the crime scene. Still, if inconsistencies persist and the prosecution cannot prove who had the iron rod at a given time, the chain is deemed broken, and the defense counsel may seek in the court to have the resultant evidence annulled.

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Maintaining the chain of custody should be considered a professional and ethical responsibility by those in charge of the evidence. It is imperative to create appropriate awareness regarding the importance and correct procedures of maintaining the chain of custody of evidence among the people dealing with such cases. It is often ignored and given very little significance as a presumably unimportant and straightforward procedure. Still, it must be remembered that it is the most critical procedure that ultimately decides the admissibility of evidence in a court of law.

The chain of custody is particularly significant in environmental sampling, which can help identify contamination and can be used to fix accountability. The laboratories should also be aware of other legal implications such as chain of custody, expert testimony, and appropriateness of scientific evidence.[10]

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A separate chain of custody form must accompany different evidence bags. The chain of custody form shall at least include the following information:

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Evidence requires conscientious handling to avert tampering. The chain of custody is the sequential documentation or trail that accounts for the sequence of custody, control, transfer, analysis, and disposition of physical or electronic evidence. The goal is to establish that the evidence is related to the alleged crime, was collected from the scene, and was in its original/unaltered condition rather than having been tampered with or "planted" deceitfully to make someone seem guilty. The chain of custody maintains the integrity of the sample. The traceability of the record of the control, transfer, and analysis of samples indicates the transparency of the procedure.[4]

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The chain of custody is the most critical process of evidence documentation. It is necessary to assure the court of law that the evidence is authentic, ie, the same evidence seized at the crime scene. It was always in the custody of a person designated to handle it, and for which it was never unaccounted. Although it is a lengthy process, the evidence must be relevant in court. The continuity of possession of evidence or custody of evidence and its movement and location from the point of discovery and recovery (at the scene of a crime or from a person) to its transport to the laboratory for examination and until the time it is allowed and admitted in the court, is known as the chain of custody or chain of evidence.

A drug test in a clinical setting using urine or blood samples is usually necessary in cases of the suspected overdosing patient getting admitted to the emergency department except for the cases where the results are positive, and the patient was in an accident or instances which may result in a trial. The screening for drugs in urine samples is usually via immunoassays.[11] Analytical methods confirm the initial results on the clinician's request. The result of medical drug testing is confidential information. Even if the drug screen is positive, it cannot be evidence against the individual for disciplinary or penal action. Hence, the chain of custody is not required. However, it is necessary to confirm the results of the initial positive immunoassay, as they may be necessary in court as evidence. In these cases, the chain of custody is essential.

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