Conversation so far:
What was Jello Biafra's prosecution about?
In June 1986, L.A. deputy city attorney Michael Guarino, working under City Attorney James Hahn, brought Jello Biafra to trial in Los Angeles for distributing harmful material to minors.
Are there any other interesting aspects about the Jello Biafra article in addition to his obscenity prosecution?
The dispute was about neither the music nor the lyrics from the album Frankenchrist, but rather the print of the H. R. Giger poster Landscape XX included with the album.
What was the result of Jello Biafra's obscenity prosecution?
The jury deadlocked 5 to 7 in favor of acquittal, prompting a mistrial; despite a motion to re-try the case, the judge ordered all charges dropped.
How did the obscenity trial affect Jello Biafra's life afterwards?
The Dead Kennedys disbanded during the trial, in December 1986, due to the mounting legal costs.
Did the band the Dead Kennedys get back together after the obscenity trial?
In 2001, Ray, Peligro, and Flouride reformed the Dead Kennedys, with former Dr. Know singer Brandon Cruz replacing Biafra on vocals.

Question: When did the trial happen?
Self-contained rewrite: When did the obscenity trial for Jello Biafra happen?