Rat Trapping Info

I began trapping rats because I'm involved with community gardens.

I really had nothing against rats other than that they dug holes and burrows that I might step into and twist an ankle or would drain precious moisture from the plants.

However, I was recently sent an article about a bacteria called leptospirosis only they carry so now I am more concerned. After reading the article, I understand why dog owners do not like rats. Dogs are more likely to encounter rat urine because they rarely wear shoes (yes. In NYC, dogs sometimes wear shoes).
http://www.slate.com/articles/health_and_science/medical_examiner/2012/1...

Initially I used poison and while that enabled killing many rats at one time, its not good for the hawks in the area that might eat the rats so many years ago I switched to using only traps. As I trap in community gardens in New York City, I always cover my traps with a box. Currently I'm using a Protecta box which is designed to hold one large trap and two racks of poison blocks. I've replaced the poison blocks with two Victor M326 spring traps and that combination works well because some rats are so small they won't set off the big trap. The big trap is a Snap-E trap. I've had the best luck with that model. The Protecta box is weighted down with a paving block because I was told that rats prefer solid structures. Just today I moved the trap to a rat run so I'll see how that goes. Previously, it was in a location away from the rat runs and since it had some success, it was pretty minor compared to the number rats that are regularly seen.

From readings of consumer responses on traps, I've heard that zapping traps are worthless.
I've also had some experience with the T-Rex style of trap and I don't like that at all.

Here are some links that I think are good resulting in my googling rat trapping.

Wikipedia: http://en.wikipedia.org/wiki/Rat_trap
Rat Trapping Tips: http://www.pest-control-products.net/835/rats/ten-essential-rat-trapping...
Rat Trapping Tips (with pictures and attitude!): http://www.247wildlife.com/rat-trapping.html
Advice from Victor: http://www.victorpest.com/store/rat-control/bm201

Monster rat (very scary): http://www.youtube.com/watch?v=1Th3RqUDKS4