He's a policeman who fights not with machine guns, but with microscopes.
6 seconds sound clip from the Bullets or Ballots (1939) classic radio play.
You can hear this line at 00:37:54 in the radio play.
Quote context
[...]
- You'll love the delicate cleaning fragrance it leaves on your skin. You'll be sure of daintiness.
- He matched the brawling and daring of gangsters with the relentless weapons of science.
- He's a policeman who fights not with machine guns, but with microscopes.
- He has a degree in law, is a master of sciences and a doctor of philosophy.
- As a 20th century Sherlock Holmes, tell us just how do you do it?
- Well, we have to deal in chemistry, ballistics, physics, toxicology, and handwriting.
- No one man can be outstanding in all fields.
[...]