What counts as a disability, and what are your legal requirements for making "reasonable accommodations"? This situation may be more common than you think... and also easier to solve. Here's what to do to provide the best (compliant) experience.
Both employees and leadership suffer when there's a lack of trust at your business. Start building trust through the Employee Management Cycle, which will help keep everyone on the same page and prompt you to re-evaluate as needed.
Thinking of skipping the pre-hire drug test, or letting an employee start work before results are in? Don't do it, especially not for business in the trades! Here are the reasons to do a drug test, and some of the risks if you don't.
You've got four options when you just can't get your employees to do something you've asked of them... and some of these options are better than others. Read HR Guy's take on how to proceed.

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