I don't know if I will hire a general inspector again, but I will have a foundation, electrical, pest inspector come out.

Even if you just do some homework on who you'd call for plumbing, pest control, etc. 

The tenants who want out claim other maintenance problems or pest problems, etc.Check your MN laws, but in CA you can deduct from their security deposit any out of pocket costs. 

Plumbing clogs, pest control, quiet enjoyment, etc.

So, what happens is, all of a sudden you're getting a bunch of maintenance calls about pests or mold or whatever. 

My properties are located in a drug infested ghetto.

They'll start complaining that there's mold or pests or whatever. 

., and pests can move into the lovely little tunnels, like mice, etc.

What they'll do is they'll start complaining about maintenance problems and pest problems, hey we have mold, mice, cockroaches, whatever - to try and get out of the lease. 

On and on.All of a sudden your perfectly maintained unit is requiring constant maintenance calls for pest control and the tenant is demanding toxic mold tests and maybe they're even calling the building department for code violations or the health department for pests.