The work
As a store detective, you would use your observation skills to spot signs of attempted theft. Your duties could include:
following shoppers or staff who behave suspiciously
calling the police and describing your observations
taking evidence from witnesses
writing short reports
occasionally giving evidence in court.
You would have the power to detain anyone trying to leave the store with stolen goods. You may also be involved in preventing the use of stolen credit cards.
You would use various kinds of technology in your work, such as two-way radios, loop alarms, mirrors, electronic tags on goods, and closed circuit television (CCTV).