Bullshit Detector was the name of a series of compilation LPs put together by the anarcho-punk

Anarcho-punk

Anarcho-punk is punk rock that promotes anarchism. The term anarcho-punk is sometimes applied exclusively to bands that were part of the original anarcho-punk movement in the United Kingdom in the late 1970s and early 1980s...

 band Crass

Crass

Crass are an English punk rock band that was formed in 1977, which promoted anarchism as a political ideology, way of living, and as a resistance movement. Crass popularised the seminal anarcho-punk movement of the punk subculture, and advocated direct action, animal rights, and environmentalism...

 and released on their Crass Records

Crass Records

Crass Records is an independent record label which was set up by the anarchist punk band Crass.-Overview and history:Prior to the formation of Crass, Penny Rimbaud and Gee Vaucher had published their creative works via their own Dial House based Exitstencil Press...

 label. Three editions were released between 1980 and 1984, consisting of demo tapes, rough recordings and artwork that had been sent to the band. The sound quality of the Bullshit Detector series was mixed, and was often very basic or poor as Crass would master the tapes directly to record without any additional production or enhancement.