Tag: hair drug test collection
Ask the Experts: Hair drug test collections
The amount of hair needed for a hair drug test is approximately 100 milligrams made up of the first 1-½ inches from the root end. The hair is typically cut from the crown of the back of the head in a manner where it will not be as noticeable. Learn more about hair drug test collections.
Hair drug test procedures
We’ve created a hair drug testing guide to help add clarity to each step of the collections process.