Curious that the prisoner tried to smuggle in drugs rather than implements that would enable escape!
Nah, for that, you just rent a hot air balloon like Lex Luthor in Superman II.
This particular prison is one most experienced criminals are unlikely to escape from. It’s a remand centre where they are held while awaiting trial, or actually on trial, and they’d still be hoping to beat the rap and get out. Escaping means committing a crime that you are pretty much certain to go down for, if you’re recaptured.
There are plenty who would the chance to escape if it came up, but not the experienced, hardcore ones, and they are the ones who are most likely to be involved in a scheme like this.