Security Screening is not done for everyone but if your security check exceeds 3 months, know that it was sent in for security screening. I received a copy of CBSA notes that I requested for over a month ago. It actually showed that my application was under security screening which started in August 2018 and ended in March 2019 (7 months). Another way to tell if your application was sent in for SS is by looking at the first 5 activities in your gcms notes. If they are all security related with redacted information and you find SP 15/SP 16 on the top right hand corner of those pages, it means your application is in security screening.