"To effect the arrest" means to carry out or accomplish the act of capturing or apprehending a person who is suspected of committing a crime. Full definition
Earlier, Troops of the Battalion on patrol at Jatoaka town effected the arrest of 10 armed robbery suspects linked to an armed robbery incidence at about 4.15 am. (securitykingng.org)
Also, he may only effect an arrest if it appears to him «that it is not reasonably practicable for a constable to make it instead» (s 24A (3)(b)-RRB-. (newlawjournal.co.uk)
Prior to this, BNI personnel had gone to his residence at La Chardo near the International Trade Fair Centre on 31st December night 2015 to effect his arrest only to be told that he was not at home. (ghanapoliticsonline.com)