BG IP1: Criminality check. At this stage, an agent checks the police certificates on your file. If all is good, then an immigration officer will update your Criminality check to Pass. Criminality is performed around the same time as your medical.
BG IP2: Security check. At this stage, they will check with CSIS and other security agencies to see if you had any criminal activities in your records or if you pose a security threat to Canada
When BG IP2 is passed, an officer will conduct a final review and will give you PPR.