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Alexander Zitoli, Steep Hill senior lab technician, homogenizes an old cannabis sample as he demonstrates part of the process of working with cannabis samples in the chemical testing/safety lab at Steep Hill Labs on Monday, June 26, 2017 in Berkeley, Calif.

Alexander Zitoli, Steep Hill senior lab technician, homogenizes an old cannabis sample as he demonstrates part of the process of working with cannabis samples in the chemical testing/safety lab at Steep Hill Labs on Monday, June 26, 2017 in Berkeley, Calif.