I'm not seeing it. I think between this pic and his mugshot, he looks 100% in good health. When I think of meth heads, they have open sores on their faces and vacant crazy stares. He looks like a model, reading for a photo shoot, IMHO.
I don't know what to make of this. When the story first broke I thought it would be a matter of 12 hours before it was solved and her remains found, and the case would be air-tight against him.
It's not working out that way so far - but truthfully LE hasn't released the info they have that are making them believe he is a person of interest. (Besides the statistical reality that when this happens, it's the reporting parent who usually has harmed the child).