 The removal of such offenders may only be enforced with the authority of an HM Inspector or Senior Executive Officer.Immigration Officers also have the power to deal with immigration offenders under the criminal proceedings part of the Immigration Act 1971 and prosecute through the Criminal Justice System.Assistant Immigration Officers' were common in the early days of the service but were dispensed with when the age bar on becoming an Immigration Officer was abolished, (date uncertain but probably before WW2).