Nail testing requires a sample size based on the free edge being the thickness of a quarter when it is turned on its side.
Nail testing goes back approximately 6-12 months depending on whether toenails or fingernails are used and length of the nail clippings.
Clipping the nails gives you the full 6-12 month time frame- minus the last 10-14 days. It takes approximately 10-14 days for any drug use to get into a person's hair or nails. It has to work its way through the body and out into the hair shaft or nail bed.
5 Panel Hair & Nail Testing
10 Panel Hair & Nail Testing
Other testing options available: