Security experts in Canada have warned that changes to the rules for renewing passports raise the risk of fraud and identity theft.Internal documents in an investigative report by CBC revealed that the Citizenship and Immigration Canada will no longer require the return of old passports – even if it remains valid for six more months.Instead, citizens are expected to cut off the corners of these travel documents.The newspaper highlights that this comes despite previous advice from the Citizenship and Immigration Canada which stated that: "establishing or authenticating identity and preventing fraud are two of the reasons for returning previous valid Canadian travel documents."The change will take effect on 1 November for online applications and 14 December for paper-based applications.Ray Boisvert, president of I-SEC Integrated Strategies and a former assistant director of intelligence at CSIS, told CBC that the move creates an "untenable risk" at a time of growing insurgencies, violent extremism and a complex security environment that requires greater co-operation with allies."It would be inappropriate to comment on any policy before it has been finalized," said Sonia Lesage, a spokeswoman for Citizenship and Immigration, wrote in an email to the news agency.