The NHTSA, which it should be pointed out never opened an official investigation into Tesla over this issue, found that there was no safety concern with the Model's suspension and have declined to request addtional info from Tesla, according to CEO Elon Musk
And lending some credence to Tesla's claim of unscrupulous forces at play (though no one disputes the original "abnormal" suspension failure that led to the inquiry, it turns out that the overwheling majority of complaints filed with the NHTSA were likely fraudulent:
Of greater concern: 37 of 40 suspension complaints to NHTSA were fraudulent, i.e. false location or vehicle identification numbers were used— Elon Musk (@elonmusk) June 10, 2016
Would seem to indicate that one or more people sought to create the false impression of a safety issue where none existed. Q is why?— Elon Musk (@elonmusk) June 10, 2016
Of course, that doesn't excuse the petty way Tesla reacted to the accusations, nor will it do anything to blunt the criticisms of those with inexplicable axes to grind with Tesla. But at least we can put the thought of a systemic problem with Tesla suspensions to rest: the National Highway Transportation Safety Administration is satisfied with their safety, and that's good enough for us.