You have a thorough physical and a urine test
Depending on what region your in, it's usually a urine test.... UNLESS one of Hallibuton's customers (Mostly the bigger ones) Shell, Exxon, Chevron require a hair sample.... Rumor has it they will be going to the hair sample soon... Good luck!
If you do not intend to be drug free (except for those that you have a prescription for) during your employment, then do not apply. They are sending a clear signal to you that drug use will not be tolerated.
For employment screening they use a urine test.
amr drug screen
Urine. They send you to a vendor like Quest.
Standard 9 Panel
Wikianswers does not give out this kind of information.
A urine test
Oral
Heroin
its a urine test
a mouth swab