Hoorah - that's an arrest rate of 0.0036%
So 2,700 arrests as a result of 75,000,000 records is a hit rate of 0.0036%.
And that's arrests, *NOT* convictions, so we can assume that a good proportion of those won't even have led to charges being brought.
With that kind of result, wouldn't it be cheaper and more accurate just to stop every twenty-ninth passenger carrying a duty-free bag in their left hand and wearing a green hat?
Paris, for all the obvious reasons...