Steven Adler was arrested on Jan 26th because he hadn't finished his community service in the time frame given by the judge. Adler went to register as a drug offender - also court ordered - on the 26th, when cops acted on the arrest warrant stemming from the unfinished community service. He was charged with "being under the influence of a controlled substance" because that was the original charge from his July arrest.
Steven Adler's people want to make it clear he was not under the influence of drugs.