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Philadelphia Mayor Michael Nutter on Friday recommended random drug tests for heavy equipment operators and other safeguards as part of a sweeping set of reforms in the wake of this week's fatal building collapse.

Nutter issued the recommendations as local media reported that blood tests on a crane operator at the site where six people died and 14 were injured showed he had been using marijuana and was taking prescription pain killers.

At a press conference at his office, Nutter said he had no independent knowledge of the drug tests.