DROPPINGS, I don't know about you but since we're having more rat calls this year, I find this to be a really valuable bunch of answers.

I have a related podcast full of info for those interested. The podcast topic is a good one- rodent exclusions and even how to sell them. Discussions on rats, mice and even squirrels.

http://rodentremoval.us/podcast/

Might try a rat size weasel box. Square wood tube, holes on each end, bait in the middle, with #1's under the holes.

Problem is they won't go for bait

Have you tried turning out the lights and wait on them with a pellet rifle, Ive done it myself and if your a good shot shoot them in the head, works, if they wont go to traps makem come to you I say, shoot them

What brand of rat poison are you using? It could be that the attractant isn't very good, this makes a huge difference with some rats. If none have ever eaten it I wouldn't think that they would be suspicious of it. I use Fastrac Blox. It has a single feeding kill that is fairly quick, have had great results.

Also, blox are formed to be anchored in a station but you can also wire them to other things where the dog can't get to them if its the station that they are avoiding. I like to wire them to the back legs of stove, fridge, washer, dryer, under sink lines, anywhere they are normally finding food or water. Main thing is that the rats have to eat it there and not run off and cache it in another spot.

A nation wide company in my area uses tracking powder and that knocks the silly out of them , then there customers call me to find the rotten rats in th

There walls ,craw, under there porch ect it's a nasty job , seems like there always deep in something , one dead rat under a porch can be hard to find but stink the whole house .

so i made a grusom trap. its a 2x4 with a hinge screwed to the floor and a pull sting release to drop the lumber on the poor sucker. it is located between the wall and the dryer. mounted a camera above. hopefully kill from the couch. wish me luck .lol

i have shot a few. and yeah between the eyes is instant. used remote pellet gun and a camera. i replay it when i get frustrated. its my happy place

i use "tom cat" bait station

where can i find a sensitive enough double sping trap? would that be a mole type of trap? or could i find it at a gun/hunting store?

Just use a victor rat trap , and bed it down side ways solid and cover with dirt , and just leave the pan showing , place by the hole were there coming and going , in your case you'll have to open a hole

Have not tried it myself, but I have heard of placing LYE in the runways. It gets on their feet and when they lick it off, it thins their blood to where they don't get enough oxygen to survive. Problem is the bodies are left where they drop.

When I was a kid, we would close off all but a couple holes under the hog sheds and stuff a garden hose into one. Flood the tunnels and clubbed them when they tried to leave the open holes. If they are under the house, in the crawl space, this probably wouldn't work too well.

REM

That would be a monster ticket here in mi , 5 grand each count plus 5 grand each kill , plus a 90 day misdemeanor for each count , 3 misdemeanor is a felony charge here in mi . Lye works great for cleaning traps but can't seem to find it anymore , do you know who sells it anymore