Is inspecting only one apartment discrimination

[Alex Zipeto]

I was wondering, in a multifamily property, is inspecting only one(out of 2-4 units) in any form "discrimination". Would I need to provide a reason for only inspecting one unit and not the other? The reason would be that the tenants are not taking care of their apartment and I want to make sure they remain conscious of taking care of the apartment. The other tenants in the building do take care of their apartment. I know all this because recently a repair was done in both units, and the one apartment is nicely kept, and the other apartment is not nicely kept at all and they have an extra animal. I want to inspect the apartment regularly to make sure the apartment stays nice.

State is PA also.