By MICHAEL MELIA, Associated Press Writer
SAN JUAN, Puerto Rico – The first warning sign came when a sharp-eyed worker sorting pills noticed that the odd blue flecks dotting the finished drug capsules matched the paint on the factory doors.
After the flecks were spotted again on the capsules, a blood-pressure medication called Diltiazem, the plant began placing covers over drugs in carts in its manufacturing areas.
But the factory owner, Canadian drug maker., never tried to find out whether past shipments of the drug were contaminated — or prevent future contamination, according to U.S. regulators.
Thirteen of the 20 best-selling drugs in the United States come from plants on this island. But an investigation….