I saw a customer get the same hard sell at a local garage today. Google "fascar brake fluid test" and you'll get a ton of information, basically from the test manufacturer saying how much better the test is than testing for water in the brake fluid. It also heavily promotes the test for garages as a way to make a ton of money, saying that about 1/2 the cars you test will fail the test (and need an expensive brake flush).
Anyway, in reference to the OP, somewhere in there they say that if the you fail the test after a flush, it's because the garage didn't use sophisticated flushing tools, and that the old "pump the pedal until the fluid is clear" method would NOT be adequate to flush the copper out. They say if you paid less than $75 for the flush, they didn't do an adequate job. They have a free offer of test strips for garages, but insist the garage has to own the right tools (which they manufacture and sell) to get the offer.
I would buy some strips myself, but the smallest tube contains 100, and costs about $50, which is more money than I have curiosity. They say they are working with AutoZone to have a DIY alternative (presumably to sell smaller numbers), but nothing on the AutoZone web site indicated it has happened.
I was hoping someone here knew more. Is this controversial? Their science seems sound, but the hard sell is unsettling. It seems unlikely that half the cars on the road today need their brake fluid flushed right now.
It's not a big deal for me, since I only own Honda's, and Honda is one of the manufacturers who has always recommended fluid flush. I usually have it done when the front pads are replaced, but that is quite a bit longer than the 3 years Honda recommends.