When drug testing, do they know the difference in hair. ex, chin hair from pubic hair, etc?

besides coarseness, is there any telling the difference? do they test hair in general...

When drug testing, do they know the difference in hair. ex, chin hair from pubic hair, etc?

yes, they can tell...in fact, there are three distinctly different types of hair on a man's face...mustache hair is different than beard which is different than sideburns...all easily identifiable from each other.

When drug testing, do they know the difference in hair. ex, chin hair from pubic hair, etc?

I believe they can test hair from any part of the body