Across the U.S., some drug treatment facilities are beginning to use incentive-based programs to reward patients who's drug tests come back negative. A team of Yale scientists studied one of these programs to try and determine it's cost and effectiveness.

"If patients submitted drug-free urine samples, they earned chances to draw from a fishbowl with 500 chips... The longer the patients remained drug-free, the more draws they earned."

These types of programs have been proven effective in helping substance abuse patients stay abstinent for longer periods of time.

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