This reminds me of when Perrier water was recalled in 1990 after it was found to be contaminated with benzene. The contamination was only discovered because a r

This reminds me of when Perrier water was recalled in 1990 after it was found to be contaminated with benzene. The contamination was only discovered because a random environmental protection lab had been using Perrier instead of deionized water for convenience. They were puzzled when benzene spikes started showing up in their samples. Eventually they realized their samples were find and the bottled water was the source.