I have heard that "recovery looks like recovery" - so if you have to work really hard to convince yourself that you see signs that maybe he's changing for the better - you're doing too much work.
I went Whoa! at the spy camera thing. I can't think of any version of "healthy" which includes secret cameras in a home you share with someone else.
Aren't there a couple of other regular posters who have had to deal with cameras and surveillance equipment installed by an alcoholic? Has this become a Thing?