Police certificate

• Why do I need to get a police certificate?
• When should I submit a police certificate?
• What if I can't get a police certificate for my immigration application?
• Do I need to get a police certificate for my time in Canada?
• Are there any countries where I should get police certificates from before applying for immigration?
• My police certificate is not in English or French. Do I need to send a translation?
• What is an affidavit for a translation?
• How do I give my fingerprints and get an RCMP criminal record check from inside or outside Canada?