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NEW ORLEANS -- A massive, months-long crackdown on synthetic drug rings has culminated with what drug enforcement officials are calling the largest synthetic drug bust ever.

More than 150 arrest warrants and 375 search warrants were served. The crackdown spans more than 35 states, 49 cities and five countries, including Louisiana.

The focus of the DEA-led investigation was so-called designer synthetic drugs, which include synthetic marijuana products -- like K-2 and Spice -- 'bath salts' and other drugs that mimic the effects of cocaine, LSD and meth.

Over the past three days, officials have seized more than 1,200 pounds of the drugs.

Authorities traced the profits from the sale of the designer drugs back to countries around the world, including the Middle East.

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