FlyHigh Hot Air Balloon Adventures is a firm with its operations based in a U$.$S$.$ state that has legalized the recreational use of marijuana. Norman is a full$-$time employee of the firm and works as a balloon $$pilot$$ and tour guide. One day, Norman$$s boss observes Norman smoking in his car before work and believes he smells marijuana when Norman walks inside the building. Which of the following actions by Norman$$s boss would be the most appropriate from a practical and legal standpoint in this situation?

He should announce a random drug test for all the employees currently working, including Norman.

He should supervise Norman closely and go along on his first scheduled flight to watch out for any signs of impairment.

He should supervise Norman as usual$$it is not legal for employers to conduct drug tests in U$.$S$.$ states where marijuana is legal.

He should follow the company policy and require Norman to pass a fitness$-$for$-$duty exam or a drug test before he can pilot the first flight scheduled on his shift.