Criminalist Cathy Richards is collecting evidence from the victim of a sexual assault. She places a sheet on the floor, asks the victim to disrobe, and places the clothing in a paper bag. After collecting pubic combings and pubic hair samples, she takes two vaginal swabs, which she allows to air-dry before packaging. Finally, Cathy collects blood, urine and scalp hair samples from the victim. What mistakes, if any, did she make in collecting this evidence

Cathy should have collected scrapings from under the fingernails of the victim.

Explanation:

From the question we are informed about Criminalist Cathy Richards who was collecting evidence from the victim of a sexual assault. She places a sheet on the floor, asks the victim to disrobe, and places the clothing in a paper bag. After collecting pubic combings and pubic hair samples, she takes two vaginal swabs, which she allows to air-dry before packaging. Finally, Cathy collects blood, urine and scalp hair samples from the victim. In this case, Cathy supposed to have collected some scrapings from under the fingernails of the victim.

Fingernail evidence in crime scenes like raping can be collected using different methods such as scraping beneath the nail, swabbing beneath the nail, and clipping of the nail. Fingernail scrapings will help the criminalist to get some Minute particles of skin, hair as well as blood after the incident, and this will help during investigation and persecution of the criminal.

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