You may have a point. Now as far as his coke and weed use, I'm wondering how he obtained the dope.
Did he steal the dope from persons he arrested or from the evidence room, did he buy the dope, or trade his wife's flesh for the dope?
Maybe "all of the above" at one point or another. Notice that she was doing cocain before he started. She was either getting it from somewhere, or he was getting it for her. Also, the story doesn't make it sound like she was an unwilling participant in the "three-way sex search".