Testing
Yes employees can be tested and yes they can be fired if they turn up positive, and if they do, you don't need to pay cessantia (payoff of benefits, etc.)
I agree with the other poster, better to test everyone with no discrimination. Better yet, find a reason to test other than your own company's policy; ie: government agency or contractor 's rules and regs or other reason...either way, you do have the right and they (employees) seldom win this type case.......a rarity. Normally employees always win no matter what, but our experience has been; not in this circumstance.