As the law stands today, "Class B" random source dealers are allowed to sell animals — and don't have to prove that they bred the animals or obtained them legally.
H.R. 2224 would ban the sale of random source dogs and cats to laboratories by Class B dealers. Instead, the bill would require that labs source their animals from "Class A" dealers who breed animals specifically for research. Labs would also be able to source animals from city pounds and individual people who can prove they bred and raised their animals.