If You Suspect a Coworker Is Diverting Drugs or Abusing

If you suspect a coworker is diverting drugs or abusing alcohol,which of these actions should you take first?

A) Call the local drug enforcement administration (DEA) office and report your concerns.
B) Confront the coworker privately and discuss your concerns face-to-face.
C) Discuss your concerns with another coworker and see if anyone else has noted suspicious behavior.
D) Provide your supervisor with documentation of suspicious incidents or behavior supporting your concerns.