Contracted employee
If you are employed by an agency (or contractor) to work as a store detective for one of their retail customers, you will need an SIA front line licence. To qualify for this you must:
be aged 18 or over
pass an identity check and a criminal record check
have completed relevant SIA approved training.
Approved SIA training takes up to four days, and can be completed before you begin work or when you start in your first job. If you already have a security qualification you may be exempt from part of the course.