I would say they're acquitted quite often on charter grounds—either unreasonable delay, or issues involving unreasonable search and seizure, or issues involving rights to counsel. Quite often they're acquitted on a number of technical defences. The Criminal Code is very technical. There are expressions such as that the crown has to “cross their t's and dot their i's”, and to some extent it's a very technical defence.
It's interesting. If you have a very experienced police officer, such as an officer who's assigned to a traffic squad and does pretty well nothing but investigate impaired driving offences, they don't make many errors. When you have an inexperienced officer who may just be working in a division, running a whole myriad of crimes all the time, quite often they make some technical mistakes, and that's really due to a lack of proper training.