I can’t believe I’m going to say this because I’m usually anti-hippie to the core. However, I think glue traps are cruel and inhumane. Torturing animals — even rats — is like training wheels for a serial killer.
That said, I am totally down with dispatching rats with extreme prejudice.
The humane — and very effective — way is Old Sparky.
These, baited with a little dry cat food, and death is pretty much instantaneous.