Good luck with the traps. I've heard mixed reports on them. If you're getting results, great!
However, it's not healthy for our industry or for the sake of truth to exaggerate the risks of certain chemicals. While I'm all for being selective in the use of any pesticides, especially if we're talking about homeowners without any professional experience with these chemicals, let's not instill fear needlessly.
While I recognize that BarnOwl's comment was in reference to the environment in general and not specifically mammals, the following lab data may prove helpful in recognizing the potency and toxicity levels for Bromethalin, the active ingredient in Talpirid:
http://www.addl.purdue.edu/newsletters/1997/spring/bromoethalin.shtml
"The LDso of pure bromethalin for dogs is 4.7 mg/kg body weight and 1.8 mg/kg for cats. Minimum lethal doses of bait are 25 g/kg in the dog and 4.5 g/kg in the cat. A typical package contains 21 grams of 0.01% bromethalin. Thus, a five kg dog would have to consume five to six packages to reach toxic levels and a five kg cat would have to consume one to two packages to reach toxic levels."
So whatever the user's decision is regarding any possible collateral effects to the environment in general, hopefully this info will prove helpful.
Best of luck!
Shane