At any time during a period of supervision, a probation agent, instead of issuing a warrant, may issue a written citation and affidavit setting forth that the probationer, parolee, or community supervision releasee, or a person released or furloughed under the Offender Management Systems Act in the agent’s judgment violates the conditions of his release or suspended sentence. The citation must be directed to the probationer, the parolee, the community supervision releasee, or the person released or furloughed, and must require him to appear at a specified time, date, and court or other place, and must state the charges. The citation must set forth the person’s rights and contain a statement that a hearing will be held in his absence if he fails to appear and that he may be imprisoned as a result of his absence. The citation may be served by a law enforcement officer upon the request of a probation agent. A certificate of service is sufficient proof of service. The issuance of a citation or warrant during the period of supervision gives jurisdiction to the court and the board at any hearing on the violation.