Ralston entered the program after he was arrested for DUII last February, but he reportedly failed a recent urinalysis randomly given as part of the diversion program.
Ralston says he wants to explain why he should be able to stay in the program.
If he finishes successfully in June, the DUII charges will be dropped. If a judge says no, he could face one year in jail.
Ralston will be back in court on Feb. 10.