Scrutator
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Lat In old English law. A searcher or baillff of a river; a water-bailiff, whose business was to look to the king's rights, as hls wrecks, hls flotsam, jetsam, water-strays, royal fishes.
Hale, de Jure Mar. pars 1, c. 5.