Initially, a small number of psyker children would be obtained for study and training. Their genetic material were also stored so that clones could be made to replace their losses if times were desperate. Psykers below Delta level are generally picked up by Acquisition teams that actively looked for potential candidates. Delta class and above were usually apprehended by Inquisitorial forces before the ARGUS Program could reach them, necessitating bribes, favors, or deals in order to obtain a powerful specimen.