I'm not exactly sure what you are referring to. I know that the U.S. agency referred to as ICE, Immigration and Customs Enforcement, has entered into some cross-designation arrangements with some municipal police forces, not with the RCMP.
We do have a program called Shiprider, under which we cross-designate U.S. law enforcement in the marine mode. We have done that on a pilot basis, and there is legislation pending with respect to establishing an appropriate legal framework for it.