onus probandi (burden of proof) etched steel and cast iron, 10’x5’x3′, 2006 “onus probandi (burden of proof)” – etched steel and cast iron, 10’x5’x3′, 2006 “onus probandi (burden of proof)” – etched steel and cast iron, 10’x5’x3′, 2006 Share: Twitter Facebook Google+