Exam 6: The Nature of Latent Prints

Most fingerprint reagents react with which components of eccrine sweat?

Name three features of a substrate that may have an impact on the persistence of latent prints.

patent prints are those left in a soft material such as clay, glue, wax, soap or tacky paint.

Are rough or highly textured surfaces conducive to latent fingerprint development? Why, or why not?

What are the three types of sweat glands in the human body, and where they found?

What is the job of a latent print examiner?

What are the factors that contribute to how long a latent print will persist on a surface?

Give two examples of patent prints.

What are latent prints?

How are latent prints recovered from items of evidence or from surfaces at a crime scene?

How are latent fingerprints left on a surface?

In what circumstances is it appropriate to sample touch DNA from a surface?

Name ten components of eccrine sweat other than water.

the majority of laboratories analyze touch DNA.

it is possible to determine the age of a latent fingerprint.

Why are fingerprints on nonporous substrates fragile?

What is the definition of a porous substrate? What is the definition of a nonporous substrate? Give two examples of each.

Is it possible to obtain DNA evidence from items that have been touched? Why, or why not?

How is contamination avoided when collecting touch DNA samples?

Eccrine sweat is 90% water.