Several lawyers, including Auckland barrister Eb Leary, have criticised the deal as a "sham" prosecution.
The Herald can reveal that Mr Leary is Schubert's defence lawyer. The 65-year-old Schubert is charged with offering to supply the undercover agent with Class-A drug methamphetamine.
Mr Leary will apply to the High Court at Auckland today to challenge the evidence in an attempt to have the charge dismissed.
He said the legal action could also affect charges against the Red Devils' members in Nelson,
Detective Superintendent Rod Drew would not comment on the Schubert case but said police targeted organised criminal groups and used undercover agents to do that - which was very dangerous work.
"They need to be supported in any way possible."
- Staff reporter