The PSISA is an acronym for The Private Security and Investigative Services Act, 2005. (https://www.mcscs.jus.gov.on.ca/english/PSIS/ActRegulations/PSIS_Act.html)
The PSISA regulates the security industry. As such, security guards must be familiar with the PSISA to ensure they follow the regulations and prohibitions, including the Code of Conduct.