Do you rekey when turning over a rental?

[Mary M.]

I always rekey all the doors in my rentals when I flip the units for a new tenant as I always worry about the liability of keys floating around. 

What is your practice ? 

What would be a landlords liability if a key from a previous tenant was used to break in and steal? 

[Mike S.]

I've installed smartkey locks on all my rentals and rekey everytime.