Hi Sunnyinlombardy
Im giving you my opinion based on my experience. My husband was sent to court and charged by the police and the SIA of hiring a doorman without a doorman licence. He was found guilty and only paid a fined of X amount of money. I submitted our application and mentioned the whole case.
According to Canada Immigration, since his case is just a simple thing and although he was found guilty but only paid a fine, it does not present a threat to the country, he was given his COPR. I reckon that since your husband, although he was charge but found not guilty, he will be ok. Canada immigration dont normally take our word for it, they will investigate and they will find out that he was not found guilty and did not go to prison - he will be fine.
If you have any documents regarding his case such docs that states he was found not guilty, maybe you can send that (maybe a certified copy).
Good luck.