a brush with the law
a brief encounter or experience with the police because of a crime
The man had a brush with the law when he was young but now he is totally honest.
Precautions while using Overhead Projectors
Business owners often use overhead projectors to present ideas visually during presentations. Overhead projectors display images onto a screen via a bright lamp, a large fresnel lens, a smaller objective lens and a mirror. Although overhead projector designs vary by manufacturer, design elements shared across manufacturers can pose certain dangers to you and your audience.