This is basically intended to limit the use of the information collected to make it related to drugs or alcohol with regard to the reason that information is kept.
The purpose of this was to limit the scope within which the information obtained would be utilized, so that it would be utilized only in cases of drugs or alcohol. Currently, it says “a federal or provincial Act”, but that may go outside of the scope of drugs or alcohol, which is the purpose for which it should be used.
I feel that this reins in the scope of what the actual information can be obtained and used for.