Home and professional drug test kits come in several different types with a variety of collection methods. Depending on which drug screening kits you find easiest to use, you can buy bulk drug test kits of urine drug test devices in casette, dip strip or dip card types. There are also the hair follicle drug test kits which may be in the the form of lab-based or self-collection kits, and the saliva drug testing kits that yield instant results or requiring positive confirmation.