▁where ▁ju ven iles ▁had ▁been ▁found ▁to ▁have ▁been ▁ab used ▁before ▁G 4 S ▁had ▁div ested ▁itself ▁of ▁its ▁youth ▁det ention ▁component . ▁ ▁Oper ations ▁ ▁Activ ities ▁ ▁G 4 S ' s ▁core ▁services ▁include ▁' mann ed ▁security ▁services ' ▁– ▁where ▁it ▁provides ▁trained ▁and ▁screen ed ▁security ▁officers . ▁The ▁company ▁also ▁provides ▁' security ▁systems ' ▁such ▁as ▁access ▁control , ▁C CT V , ▁intr uder ▁al ar ms , ▁fire ▁detection , ▁video ▁analyt ics ▁and ▁security ▁and ▁building ▁systems ▁integration ▁technology . ▁' Mon itor ing ▁and ▁response ▁services ' ▁is ▁another ▁core ▁service , ▁where ▁G 4 S ▁provides ▁key ▁holding , ▁mobile ▁security ▁pat rol ▁and ▁response ▁services ▁and ▁alarm ▁receiving ▁and ▁monitoring ▁facilities . ▁G 4 S ▁also ▁provides ▁' secure ▁facilities ▁services ' ▁which ▁includes ▁integrated ▁facilities ▁services ▁for ▁entire ▁sites ▁or ▁est ates ▁for ▁commercial ▁customers ▁and ▁govern ments . ▁The ▁business ▁provides ▁' ris k ▁management ▁and ▁consult ancy ▁services ' ▁which ▁also ▁includes ▁mine ▁detection ▁and ▁clear ance ▁services . ▁G 4 S ▁also ▁provides ▁electronic ▁tag ging ▁and ▁monitoring ▁of ▁off enders ▁at ▁home ▁or ▁in ▁the ▁community . ▁The ▁company ▁provides ▁back - office ▁support ▁functions ▁for ▁police ▁forces , ▁support ▁for ▁front - line ▁polic ing , ▁including ▁the ▁provision ▁of ▁cust ody ▁suite ▁services ▁and ▁for ens ic ▁medical ▁services . ▁It ▁also ▁man ages ▁ju ven ile ▁and ▁adult ▁cust ody ▁cent res . ▁This ▁includes ▁the