alright, its the basic foundation for all officers to 'know' the law that they are charged with enforcing. When states change their laws its usually on a fiscal approach (mid june or may). This state has a 'refresher' course they offer to help fufil the 20 hrs per year training that needs to be done to stay certified. This course is usually offered in November. So as you can see there is around a 6 month gap of when laws are changed and when they tell cops about them. This is a state problem obviously, but it transfers federally because of the same reasons. Most states (GA DOESNT) do not issue out the law codes every year. Most cops get one set in the academy and thats it. Here is where the ever present 'reasonable' term gets thrown in again. given a reasonable amount of time from the law change to when a cop has to enforce that law, the cop is 'supposed' to know the changes. MOSTLY they have to do it on their own volition, or if they're lucky enough in 'roll call updates'. Things that are being heard 'now' in the USSC do have to deal with officers, and so if things 'do' change the officers must know the 'changes' and how it affects their jobs in a 'reasonable' amount of time.
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Vi et Consilio