ate ▁susp icious ▁behaviour ▁from ▁numerous ▁screens ▁and ▁to ▁enable ▁automatic ▁alert ing . ▁However , ▁the ▁att ent iveness ▁of ▁the ▁surve ill ance ▁personnel ▁may ▁be ▁threatened ▁by ▁false ▁reli ance ▁on ▁automat ics . ▁C CT V ▁is ▁more ▁effective ▁if ▁used ▁in ▁conj unction ▁with ▁electronic ▁article ▁surve ill ance ▁( E AS ) ▁systems . ▁The ▁E AS ▁system ▁will ▁warn ▁of ▁a ▁potential ▁shop l if ter ▁and ▁the ▁video ▁may ▁provide ▁evidence ▁for ▁pro sec ution ▁if ▁the ▁shop l if ter ▁is ▁allowed ▁to ▁pass ▁checkout ▁points ▁or ▁leave ▁store ▁prem ises ▁with ▁un b ought ▁mer ch and ise . ▁ ▁Many ▁stores ▁will ▁use ▁public - view ▁mon itors ▁in ▁the ▁store ▁to ▁show ▁people ▁there ▁that ▁they ▁are ▁being ▁recorded . ▁That ▁is ▁intended ▁as ▁a ▁d eter rent ▁to ▁shop l ifting . ▁Some ▁stores ▁use ▁in exp ensive ▁dummy ▁cam eras . ▁Even ▁though ▁these ▁fake ▁cam eras ▁cannot ▁record ▁images , ▁their ▁presence ▁may ▁d eter ▁shop l ifting . ▁ ▁Electron ic ▁article ▁surve ill ance ▁Electron ic ▁article ▁surve ill ance ▁( E AS ) ▁are ▁magnetic ▁or ▁radio - fre quency ▁tags ▁that ▁sound ▁an ▁alarm ▁if ▁a ▁shop l if ter ▁leaves ▁a ▁store ▁with ▁store ▁items ▁that ▁have ▁not ▁been ▁paid ▁for . ▁E AS ▁methods ▁are ▁second ▁only ▁to ▁C CT V ▁in ▁popular ity ▁amongst ▁ret ail ers ▁looking ▁for ▁invent ory ▁protection . ▁ ▁E AS ▁refers ▁to ▁the ▁electronic ▁security