Final answer:
If a pharmacist is concerned about a prescriber involved in diversion, they should report it to the DEA Diversion Control Division.
Step-by-step explanation:
If a pharmacist has a concern that a prescriber is involved in diversion, they must report it to the appropriate authorities. In the United States, pharmacists can report such concerns to the Drug Enforcement Administration (DEA) Diversion Control Division. The DEA investigates cases of prescription drug diversion, which involves the illegal distribution or misuse of prescription drugs. By reporting their concerns to the DEA, pharmacists can help prevent the abuse of prescription drugs and protect public health.