mgnlky is right. I think there is some confusion because CIC used to accept FBI channelers from January 2015 through May 2015, then CIC realized that FBI approved channelers were only authorized to issue PPC to US citizen and US PR, then changed back in May 2015 to the current rules.
Here's the CIC webpage back in February 2015.
http://web.archive.org/web/20150218074728/http://www.cic.gc.ca/english/information/security/police-cert/north-america/united-states.asp
If you are not a citizen of United States:
If you live in United States:
You can download the application form from the FBI website or send a request by mail (see Special notes and considerations for complete address).
There are two options:
Option 1: You must fill out the applicant information form and obtain a set of your fingerprints.
Option 2: You may submit the application to an FBI-approved channeler; a private company contracted to provide the certificate on behalf of the FBI. Processing times may vary. Please check the FBI website for a list of approved channelers.
Please mail your completed fingerprints card along with a certified cheque or money order for the applicable processing fees, payable to the U.S. Treasury (see Special notes and considerations for complete address).
The FBI or channeler will send you a letter with the results of your record check. That letter will be your police certificate. You should send the letter and any attached documents to the Citizenship and Immigration Canada office processing your file. All police certificates must be originals. Photocopies will not be accepted.
If you live outside of United States:
You can download the application form from the FBI website or send a request by mail (see Special notes and considerations for complete address).
There are two options:
Option 1: You must fill out the applicant information form and obtain a set of your fingerprints.
Option 2: You may submit the application to an FBI-approved channeler; a private company contracted to provide the certificate on behalf of the FBI. Processing times may vary. Please check the FBI website for a list of approved channelers.
Please mail your completed fingerprints card along with a certified cheque or money order for the applicable processing fees, payable to the U.S. Treasury (see Special notes and considerations for complete address).
The FBI or channeler will send you a letter with the results of your record check. That letter will be your police certificate. You should send the letter and any attached documents to the Citizenship and Immigration Canada office processing your file. All police certificates must be originals. Photocopies will not be accepted.