Bertrand Tavernier co-wrote this anti-drugs film with a Drug Squad detective, and dedicated it to his ex-heroin addict son.
"L.627" refers to the article in the French legislation on public health pertaining to narcotics.
A journal of working on the film was written by Bertrand Tavernier and published in Projections Issue No. 2 which is published yearly. The journal section is called "I Wake Up, Dreaming: A Journal for 1992" and begins on page 252.