How do you know that the testing costs $298 and by what level of laboratory? Do you really believe that the Navy would hire a "fly-by-night" lab to do these analysis? If you do I have a bridge that I would love to sell you.  The Navy, in all likely hood did due diligence and contracted with a very well qualified lab to do the analysis with results that can stand up in  a court of law or in other words "forensically defensible".