As far as I ran into, unless the doctor calls the pharmacy and restricts the protocol of whom can pick up a prescription, there are no legal or ethical reasons a Pharmacy could restrict a pick up.
If they are concerned of a suicidal purpose for some reason (nothing I can relate) perhaps they may call the doctor and ask if their instincts are that the patient is at risk and have a concern.

But neither of these scenarios fit Derrick. I did have doctors restrict my dd picking up her meds, but it was to take away the potential of "accidental OD." which ultimately, it was the pharmaceutical cause not dd.