Dragnet (1947 film)

Dragnet is a 1947 American crime film directed by Leslie Goodwins and starring Henry Wilcoxon, Mary Brian, Douglass Dumbrille, Virginia Dale, Don C. Harvey, and Ralph Dunn. The screenplay was written by Barbara Worth and Harry Essex. The original music score was composed by Irving Gertz. It is also known as Dark Bullet and A Shot in the Dark.

After examining the body and the mans clothes, Geoffrey concludes he wore a Harris Tweed coat and had Sterling pound notes on him, and therefore has to be of English origin. Geoffrey also discovers a fluorescent paint on the coat, which would suggest it is the same paint as the one used to mark floating objects in water to easier spot and rescue them.Since the dead man had no water in his lungs he hasnt drowned,but maybe got the paint on him picking something up from the water, for example a life jacket. ........

Source: Wikipedia