Know For Sure
- बर्ष: 1941
- देश: United States of America
- विधा: Drama
- स्टुडियो: Research Council of Academy of Motion Picture Arts and Sciences, United States Public Health Service
- कीवर्ड: syphilis
- निर्देशक: Lewis Milestone
- जात: Ward Bond, Joseph Crehan, Samuel S. Hinds, Tim Holt, Edwin Maxwell, Etta McDaniel