Yes, the police here are allowed to conduct roadside stops for document or equipment checks, and yes, it is considered being "detained" ... but they are allowed to detain you for such a roadside stop or equipment check for a "reasonable" time period. What's "reasonable" is left to the courts to decide ... and that's a function of whether they have reasonable suspicion. For example, at a RIDE check, they're allowed to stop you for the few seconds (verbal check) or perhaps minute or two (roadside breathalyser) it takes to establish if there is a reasonable suspicion of a violation. If that roadside breathalyser indicates a violation then that timeframe is off. They're allowed to haul you off for proper testing, and then "reasonable" becomes measured in hours.
For these noise tests, it's going to be the same sort of thing. If they set up a checkpoint and are stopping everyone, and you with your bone stock exhaust system get flagged in, they are allowed to detain you for the few seconds or perhaps minute or two that it takes them to establish whether you're probably going to be in violation or not. A time consuming detour out of your plans, to an out-of-the-way but "approved" testing location, might be found to be OK with the courts if you really were non-compliant and it really did end up with you being charged with the offence ... but if they do that to your quiet bike with its bone-stock exhaust system, that's probably not OK. I am saying "probably" because I don't think anyone has done us the public service of having this happen to them and challenging it in court yet.
The Caledon cops first gave up doing the elevated-RPM part of the SAE test, because they weren't able to prove the facts in a manner satisfactory to the courts.
For these noise tests, it's going to be the same sort of thing. If they set up a checkpoint and are stopping everyone, and you with your bone stock exhaust system get flagged in, they are allowed to detain you for the few seconds or perhaps minute or two that it takes them to establish whether you're probably going to be in violation or not. A time consuming detour out of your plans, to an out-of-the-way but "approved" testing location, might be found to be OK with the courts if you really were non-compliant and it really did end up with you being charged with the offence ... but if they do that to your quiet bike with its bone-stock exhaust system, that's probably not OK. I am saying "probably" because I don't think anyone has done us the public service of having this happen to them and challenging it in court yet.
The Caledon cops first gave up doing the elevated-RPM part of the SAE test, because they weren't able to prove the facts in a manner satisfactory to the courts.