▁They ▁are ▁used ▁to ▁d eter ▁the ▁use ▁of ▁boost er ▁b ags ▁which ▁are ▁used ▁to ▁shield ▁E AS ▁tags . ▁ ▁Staff ▁roles ▁ ▁Store ▁detect ives ▁can ▁pat rol ▁the ▁store ▁we aring ▁plain cl oth es ▁and ▁act ▁as ▁if ▁they ▁are ▁real ▁sh opp ers . ▁They ▁may ▁brow se , ▁examine , ▁carry , ▁or ▁even ▁try ▁on ▁mer ch and ise , ▁while ▁looking ▁for ▁signs ▁of ▁shop l ifting ▁and ▁looking ▁for ▁possible ▁shop l if ters . ▁Many ▁large ▁ret ail ▁companies ▁use ▁that ▁technique . ▁Store ▁detect ives ▁will ▁watch ▁a ▁shop l ifting ▁suspect ▁conce al ▁an ▁item , ▁then ▁stop ▁them ▁after ▁they ▁have ▁ex ited ▁the ▁store . ▁Those ▁types ▁of ▁personnel ▁must ▁follow ▁a ▁strict ▁set ▁of ▁rules ▁because ▁of ▁very ▁high ▁li ability ▁ris ks . ▁Many ▁large ▁ret ail ▁or ▁gro c ery ▁stores ▁have ▁a ▁store ▁detect ive ▁to ▁watch ▁for ▁shop l if ters . ▁Most ▁of ▁those ▁stores ▁use ▁secret ▁ver bal ▁codes ▁over ▁the ▁PA ▁system ▁to ▁alert ▁management , ▁other ▁loss ▁prevent ion ▁personal , ▁and ▁associ ates ▁that ▁there ▁is ▁a ▁shop l if ter . ▁Store ▁detect ives ▁must ▁follow ▁a ▁suspect ▁around ▁the ▁store ▁by ▁foot ▁or ▁by ▁watching ▁video ▁mon itors ▁and ▁observe ▁every ▁move ▁the ▁person ▁makes ▁so ▁that ▁they ▁do ▁not ▁face ▁a ▁law suit ▁for ▁app reh ending ▁or ▁arrest ing ▁the ▁wrong ▁person . ▁ ▁The ▁presence ▁of ▁uniform ed ▁security ▁gu ards ▁acts