Claude Létourneau, the man charged with leaving dirty needles in clothing at various Sherbrooke department stores, will remain behind bars pending more charges.
He will remain incarcerated until his next court date on July 19.
Crown Prosecutor, Émilie Baril-Côté, said more charges could be laid but would not expand on what they might be.
Létourneau, 49, was charged with 29 counts of armed assault, after DNA evidence lifted from the syringes linked him to the incidents.
Eight people have pricked themselves with the syringes and have undergone testing to ensure they are free of infections. They are awaiting test results.
Twenty-five needles have been found since January.
The last needle was found on May 24 at The Bay in Carrefour de l'Estrie, a shopping centre in Quebec's Eastern Townships.