Only one of the sixteen suspects rounded up last week by the F-B-I and police in Bloomington-Normal is free on bond.
Eight of the suspects were in Federal Court in Peoria Monday.
A judge agreed to have the sting operation presented to a grand jury.
Law enforcement officials say "Operation Prairie Eagle" started in August of last year.
The 16 suspects face charges of distributing crack cocaine and marijuana.
Tabitha Harris is the sole suspect to be released on bond.
The rest remain behind bars.