Why plastic bottles read "do not reuse"

TORONTO (CP) - While people may think they're doing a good deed for the environment when they reuse water bottles for anything from orange juice in a bagged lunch to a week's worth of water refills from the office water cooler, researchers say they could be risking their health. Dangerous bacteria and potentially toxic plastic compounds have been found in the types of water bottles typically reused in classrooms and workplaces countrywide.