There are 20 blood groups with which we deal and often we can eliminate 19 out of 20 suspects by a blood grouping test.
10 seconds sound clip from the Bullets or Ballots (1939) classic radio play.
You can hear this line at 00:39:41 in the radio play.
Quote context
[...]
- What can you learn from those whose tresses are a bit more abundant?
- You'll do fine as long as you have a single hair left on your head.
- Saliva tells us to what blood group the man who smoked the cigarette belongs.
- I can see it's getting harder and harder to commit murder.
- Not to commit it, but to get away with it.
- But while we solve crimes, the public can do far more than we can do in preventing them.
- Don't be intimidated by the threats and boasts of racketeers.
- Every time you surrender, you betray not only yourself, but your neighbors and your community.
- At the first sign of a threat, get in touch with your local authorities.
[...]