Postcards arriving at the Broward County Jail in Fort Lauderdale contained more than just drawings.

Federal prosecutors say the postcards were laced with a hallucinogenic drug that has similar effects as LSD. They say inmates paid $10 for a tiny piece of a card, which they put in their mouths to absorb the drug.

The South Florida Sun Sentinel (http://bit.ly/1E1hRew ) says two inmates pleaded guilty last week to federal drug charges. Authorities say a third man who was on the outside, 56-year-old William Hahne, has pleaded not guilty to possessing and distributing the drug.

Prosecutors say Hahne mailed the cards to the other two inmates.

Hahne's attorney says he's undergoing a psychiatric evaluation at Miami's Federal Detention Center.

Jail officials began investigating in August on a tip from an inmate.

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Information from: Sun Sentinel , http://www.sun-sentinel.com/