You can't assess damage fully and you might have a mess getting them out. 

Once you have done that things will smell better unless there are fixtures that have been damaged too (cabinets), so be on the lookout.

There's a home located on my block with frozen pipes and radiator damage that I'd like to buy.

Here is a quick list of things to look for when DFD:•Missing Window Blinds•Dead / Overgrown Lawn•Bad Roof•Lots of Trash and Cars with Filthy Windows–No License Plates, Flat Tires•Broken Windows•Lots of Deferred Maintenance / General Disrepair•Peeling Paint•Overgrown Trees–Lots of Tree Litter on Roof•Fire Damage•Graffiti•Owner Board Up•Notices Posted on Doors / in Windows•Uncollected Mail / Newspapers / Phone Books in Driveway/Mailbox•General AbandonmentWrite down the address & take notes, go home and research owner info/mailing address using local title company, send letter.

I Want control on who is living there and the metrics I use to screen them but the best return on my investment and reduce overturn and damage to property. 

They should obtain a renters' policy that both will cover their personal belongings and give you some protection for unintentional damage they cause as a result of a cooking fire or the like.Hope that helps!

They simply don't have the manpower to deal with issues like property damage.  

@Kahanu Noa The Bank caved...i probably threatened to sue them for damages.

You may end up evicting once the security deposit runs out, and then what's left for damages?

A normal vacancy clause excludes theft, vandalism, water damage, attempted theft, sprinkler leakage, and glass breakage if the building has been vacant for over 60 days.