During weeks 1-12 of treatment:

The first negative specimen is worth 10 points or $2.50 ($0.25 x 10 points)

• For each subsequent, consecutive negative urine specimen, the value of the voucher increases by 5 points (e.g. second = 15 points or $3.75, third = 20 or $5.00, etc.)
• The equivalent of a $10 bonus is earned for three consecutive negative urines in a week.
• Positive specimens or failure to submit a specimen on schedule resets the value of vouchers back to the initial $2.50
• Five consecutive negative specimens after submission of a positive speciment returns the value of vouchers to their level prior to the reset

During weeks 13-24, the magnitude of the reinforcer is reduced to one state lottery ticket for each cocaine-negative specimen.