You may be able to be grand-parented into CAMFT in an equivalent member category. You can find an application on this link under the "Membership" tab.
As an LMFT you are welcome to join CAMFT in the Registered Marriage and Family Therapist (RMFT) member category. You can find an application on this link under the "Membership" tab.
Only CAMFT members in the Registered Marriage and Family Therapist member category are able to use the RMFT designation.
Regulation of C/MFT practice is a provincial responsibility and varies widely from province to province. You can find information about regulation in different provinces here.
CAMFT is not a regulatory body; our focus is on supporting our members in their training and in their practice. Our RMFT designation sets a high standard, but is not actually required for practice.
You must find out what the rules are in the state you practice in. You must also find out what the rules are in the province your client is going to be in. If C/MFTs are regulated in the province your client is in you must contact the regulatory college.
Regulation varies widely across Canada. You can find information about the provinces here.
If you are working in a province that is regulated you must join the regulatory body unless you already belong to a regulatory body. eg RSW, nurses.