(3) Consideration of rehabilitation. In determining whether to terminate tenancy for illegal use of drugs or alcohol abuse by a household member who is no longer engaged in such behavior, the owner may consider whether such household member is participating in or has successfully completed a supervised drug or alcohol rehabilitation program , or has otherwise been rehabilitated successfully ( 42 U.S.C. 13661 ). For this purpose, the owner may require the tenant to submit evidence of the household member's current participation in, or successful completion of, a supervised drug or alcohol rehabilitation program or evidence of otherwise having been rehabilitated successfully.