Destoying the "foreign" containers sounds good. But with the current machines, they have difficulties already identifying valid cans. People are going to get irate when they have the machine mis-read a good container, call it a "foreign" container. The requirement of 85% of the "foreign" containers does not put any requirement on the reading of valid containers. I believe that the manufacturers of the reverse-vending machines will be overly zelous in calling containers "foreign" and destroy them without compensation in order to acheive the 85% rate.
Note that an 85 percent rate amounts to one can in every 6-pack to be improperly identified.