Is there a duty to report clause in your state's legislation? The province of BC's Safety Standards act makes that knowledge reportable and if it could be proved you did not report it to the inspection authority you could become label for damages should anyone get hurt. Using the bond wire as a current carrying conductor can set up a shock hazard to non current carrying parts of the bonding system.
I hate talking to my neighbours about electrical matters and tell them to stop before they reveal anything I may have a duty to report.
It is a little like asking the policeman living next door over to your pot party ;-)
