WASHINGTON (AP) — The Drug Enforcement Administration is trying to stay one step ahead of synthetic drug makers, wholesalers and retailers as it broadens its crackdown on the growing black market product.

DEA agents fanned out across the country Wednesday and made more 150 arrests and served about 200 warrants, DEA spokesman Rusty Payne said. The largest single operation was a statewide effort in Alabama, though agents also were active in 28 other states. Authorities also seized more than $20 million in cash and assets, the DEA said.