What’s the best way to handle drug activity?

[Elijah VanDenBerg]

I was tipped off by one of my tenants that they have been noticing multiple vehicles stopping by my apartment building at all hours of the day and through the night. He also informed me that the tenant involved had been arrested for drug possession and is now jobless. Multiple ideas come to mind on how to handle it, but I would like to hear other thoughts or actions that have proven successful.

Thanks in advance!