Depending on the security needs, security guards may work inside or outside. In some cases, they will monitor security screens watching for suspicious activity

Their duties include searching for drugs and explosives, locating missing people, finding crime scene evidence, protecting people, and attacking criminals who are fleeing from or attacking police officers

Undercover operations occur where investigators infiltrate criminal networks or pose as offenders to uncover organized crime activity. These operations occur in many countries with different types of oversight

Closed circuit television (CCTV) records images of people in certain public places including town centres, roads, airports, and on public transport. CCTV images can be used as evidence in court

A security Guard duties are to provide security, to check legal age and drinking age, to refuse entry for intoxicated persons, and to deal with aggressive behavior or disobedience with statutory or establishment rules

An electric fence is a barrier that uses electric shocks to deter people and/or other animals from crossing a boundary. The voltage of the shock may have effects ranging from discomfort to death.