A guide to the types of employee drug testing: Pre-Employment, Post-Accident, Random Selection, and Reasonable Suspicion.
Marijuana may be legal in your state, for medical or even recreational purposes. So can you (and should you) test employees for drugs and fire anyone who tests positive?

We’re not a generic HR firm. We’re built for service companies with crews, callouts, overtime challenges, and fast-moving schedules. You get practical HR support that fits the real world, not corporate templates.
The HR Guy – HR Support for Service Businesses