National Police officers at the Benidorm station have complained of headaches, nausea and inability to concentrate ever since more than 600 pot plants were brought in from a raid on a villa in Calpe last week.
The union said the ministry of health was not moving quickly enough to destroy large drug caches seized by officers.
ThinkSpain said Saturday the problem was apparently not limited to police officers. The two Britons arrested in the raid also fell ill, and resident of the neighborhood around the station said the pungent marijuana smell is very noticeable on the streets.
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