For clarity,
Random drug testing IS legal in the US, and IS a requirement for a range of commercial operations (I believe, including maintenance operations). So it is not that 'unreasonable' that some congressman will get in a twist about the 'lesser' safety of European regulations (not withstanding there is no evidence of a problem - after all Europe does not have a monopoly on solving non-problems). I believe the twice yearly inspection is an increase and that it was a protectionist action.
The bigger issues must be around airline ownership and a very different view in Europe vs. the US with regard to monopolies (hence Europe's desire to allow long term immunity from prosecution and America wanting this immunity to fall away quickly).