Police records checks are only valid on the day they are issued, since information can change from day to day. They are a “snapshot in time” only. The police to not determine an expiry date. This is up to the agency/employer. Some might accept a criminal records check that is 3-6 months old, while other may want a new one.
Since a person can be clear of charges or criminal activity today but could be arrested and charged tomorrow, we offer no guarantees on the validity of a criminal record check beyond the actual date on which the search was conducted. As well, not all criminal convictions are reported to the RCMP, and more recent dispositions may not be updated on their system at the time a check is conducted.
In our experience, most employers will ask for a new criminal records check if a your current one is over 3-6 months, and almost certainly if it’s older than one year. However, this is entirely at the discretion of the agency/employer.