An unusual side effect of the rural purge was the reduction of the laugh track. Most of the rural-oriented programs were filmed in the single-camera setup without a studio audience, with the canned laughter added by laugh-track proprietor Charley Douglass. The newer shows that came to television in the early 1970s were multiple-camera setups with live studio audiences, a trend that would become the norm throughout the 1970s and even into today, with Douglass's laugh track mostly limited to sweetening. This was not possible for "M*A*S*H", which was filmed on location, but due to the occasionally serious nature of the material, producers of the military hospital dramedy did not want a laugh track to be used (CBS compromised: no laugh track was used in certain scenes, most notably the operating room).