Doing the rounds on social media..
Travel warning Thailand: Bangkok police accelerate random visitor urine tests, searches, interrogations on western tourists and expats « WoWasis TravelBlog
This would appear to be based off this BKK post information.
IMO, taking one report and making it a trend is pushing it too far.. But seeing as I see this now in 3 or 4 Thai related facebook groups this morning, its very much a sign that social media has the power to shine a light on small events.