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Answer :
D) Hair sample is sometimes collected for drug testing because it is not easily tampered with or altered.
The type of sample that is sometimes collected for drug testing because it is not easily tampered with or altered is D) Hair sample.
Hair samples are considered difficult to tamper with because they provide a longer history of drug use compared to other samples. Drugs incorporated into hair remain detectable for a longer period, often up to several months or even years, depending on the length of the hair. This makes hair samples a reliable option for detecting past drug use.
In contrast, saliva, blood, and urine samples are more susceptible to tampering or alterations, and they typically reflect more recent drug use rather than long-term patterns.
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Final answer:
A (D)hair sample is often used for drug testing because it is not easily tampered with and provides a historical record of drug use. Other samples like urine and saliva can be more easily altered, and blood sample requires specific processing steps that may also identify tampering.
Explanation:
The sample that is often used for drug testing and is not easily tampered with or altered is a hair sample (D). Hair samples provide a longer detection period for drug usage and are considered less susceptible to adulteration compared to other types like urine or saliva samples. This is because the drugs get incorporated into the hair as it grows, preserving a history of drug use over time.
While urine samples are commonly used due to their ease of collection, they may undergo no preparation before analysis and could potentially be tampered with. In contrast, blood samples require more invasive collection methods and are typically processed to obtain plasma, possibly adding steps where tampering could be detected. Moreover, DNA uniqueness in hair samples can contribute to confirming the identity of the person tested, thus providing a double function - detection of drug use and verification of the individual.
Biological analysis of trace elements in hair can show exposure to substances like arsenic, mercury, and lead, which are toxic in certain concentrations. Substances collected in hair samples undergo biological analysis using techniques that can include atomic absorption spectroscopy (AAS), highlighting the sample's importance in health and forensic investigations.