recidivist

n. one who regresses repeatedly, one who relapses into a previous condition (esp. into a life of crime)

Recidivism (IPA: [ɹɪˈsɪdɪvɪzm̩]; from recidive + ism, from Latin recidīvus "recurring", from re- "back" + cadō "I fall") is the act of a person repeating an undesirable behavior after they have either experienced negative consequences of that behavior, or have been treated or trained to extinguish that behavior. The term is most frequently used in conjunction with substance abuse and criminal behavior. For example, scientific literature may refer to the recidivism of sexual offenders, meaning the frequency with which they are detected or apprehended committing additional sexual crimes after being released from prison for similar crimes. (If to be counted as recidivism the re-offending requires voluntary disclosure or arrest and conviction, the real recidivism rate may differ substantially from reported rates.) As another example, alcoholic recidivism might refer to the proportion of people who, after successful treatment by Alcoholics Anonymous, report having, or are determined to have, returned to the abuse of alcohol.
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Noun
1. someone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior)
(synonym) repeater, habitual criminal
(hypernym) criminal, felon, crook, outlaw, malefactor
2. someone who lapses into previous undesirable patterns of behavior
(synonym) backslider, reversionist
(hypernym) wrongdoer, offender

n. recidivist, repeater, prison bird, lag

A repeat offender, someone who relapses into crime.(See Judicial-criminal)