So a man, while he is being crushed by police, will suddenly think "Wow, my head is spinning, it must have been all those drugs I ate." and then verbalise the thought? Or was he denying the rationalisation used for his suffucation?

I think context matters here a lot, and occams razor suggests that a man being attacked by police officers because he is supposedly on drugs will deny the drug taking, rather than invent a whole new category of problem for himself.