Every Lock You Have Is Worthless

After reading Nearly Every Lock You Have is Worthless,  I thought it might be worth it to put up a chain - not that it would keep out anyone intent on breaking in, but at least it would be evidence to the insurance company.

The comments are useful  - I never knew about biometric deadbolts or Abloy locks.  I liked this one. 

Cheapest way to do that is an NRA sticker on your screen door. Even criminals perform cost/benefit analyses in their heads.