Know For Sure
- Leto: 1941
- Država: United States of America
- Žanr: Drама
- Studio: Research Council of Academy of Motion Picture Arts and Sciences, United States Public Health Service
- Ključna beseda: syphilis
- Direktor: Lewis Milestone
- Igralska zasedba: Ward Bond, Joseph Crehan, Samuel S. Hinds, Tim Holt, Edwin Maxwell, Etta McDaniel