This is the answer from my friend who owns her own eldercare business:

Hmmm….. if the elderly person is not competent/ vulnerable, etc., and they are being given some additional substance, I'd call Adult Protective Services, and get them involved. (My license requires that I report anything like this)

This can take many forms, but it could eventually remove the person from their current environment, place them in a more protective situation, etc. Guardianship can also evolve, and this would entail appointing an attorney for the client, to represent him/her alone. APS can also bring in the police, etc.

Hope that is helpful. Each jurisdiction has an Adult Protective Services Program, under the Department of Social Services in the county.

-----------------