Not entirely sure on this, but I believe the administration of warnings, etc. while on course is up to the discretion of the school in question. At least up to the point where you start getting into Final Warnings/Progress Review Boards (PRB), which from what I have seen are fairly standard between schools.
The Infantry School in Gagetown, unless it's changed in the past year, still uses a chit system on Officer training courses. For example:
- a shitty morning room inspection throughout the platoon will get you a red 'leadership chit' if you're the course senior that day
- doing something stupid like forgetting an important piece of kit back in the hide when going on patrol will get you a red 'follower chit'
Two or three (I forget) chits for the same genre of offense will put you up on Initial Warning.
In St. Jean, however, they have a system of "Conduct" warnings before you get to the PRB stage.
Based on what I have seen, then, there is no universal standard as to whether chits are/are not to be used, as I have seen 2 different schools use 2 different systems. Perhaps there is a grown up lurking around here who can answer with official-ness.