Ban Rat/Mice Poison (SAGRs) in Massachusetts

SGARs are second-generation anticoagulant rodenticide that are highly toxic and can cause death by internal bleeding. They can also cause long-term effects, such as slower reaction times and worse reflexes. Because SGARs break down slowly, they can build up in an animal's tissue and remain poisonous for months or years after death.

Secondary Animal Getting Rodent Syndrome (SAGRS) occurs when a non-target animal eats another animal that has already been poisoned by a second-generation anticoagulant rodenticide (SGAR)

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This is a handy guide explaining with pictures how it works: