I've read this proposed subsection (2) of 254, and I don't see.... There are only reasonable grounds to suspect that the person has taken the drug, not that they were impaired. I've read it, and I don't see it.
Secondly, it's very clear that at the very end of proposed paragraph 254(2)(a), it says that the police officer can require the person “to accompany the peace officer for that purpose”--“to accompany”, which may not be the equivalent of an arrest, but it does--