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I didn't find any general information, but I found the following:

Hamilton, Ontario Police Department
How long is a police check valid? Is there an expiry date?
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 do not determine an expiry date; this is up to the agency/employer. Some might accept a police Please search forum before posting:

http://www.canadavisa.com/canada-immigration-discussion-board/profiles/DoubleS-u530718.html Double s posted this.

check that is 3-6 months old, while others 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 police 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 screening check if the current one is beyond 6 months, and almost certainly if it's older than one year. However, this is entirely at the discretion of the agency/employer.
http://www.hamiltonpolice.on.ca/NR/rdonlyres/D373731D-BAD6-4E10-9646-E5959D37E4BC/2976/FAQs.pdf

Vancouver, BC Police Department:
Q. How long is a Police Information Check valid?

A. The Vancouver Police Department does not include expiry dates on completed Police Information Checks. It is the discretion of an employer or volunteer organization to establish guidelines related to recent and acceptable Police Information Checks.
http://vancouver.ca/police/organization/records-checks-fingerprinting/faqs-records-check.html
 
when i called RCMP they said its good till it should be. they said it depends to whom you are sending it for.. i dont know what to do.. i have the certificate from December 2nd but i cant send it until April 1st due to some reasons.. so will it be ok to send CIC 5 months old certificate?
 
varinder1717 said:
when i called RCMP they said its good till it should be. they said it depends to whom you are sending it for.. i dont know what to do.. i have the certificate from December 2nd but i cant send it until April 1st due to some reasons.. so will it be ok to send CIC 5 months old certificate?

Are you in Canada? If you got rcmp check after you left Canada then it should be good until you come back to Canada. If you are in Canada then you don't have to submit it. If req cic will ask for it.