Cooksey works in the CDC's mycobacteriology laboratory branch. He has co-authored papers on diabetes and infectious diseases, including TB. He recently co-authored a report on a bacteria outbreak in bone marrow transplant and oncology patients in a hospital water supply.
I just think it sounds fishy the lawyer contracted the very disease his F-I-L is an expert in.
If this were a Stephen King novel, the CDC guy would've been working with an experimental strain of TB at home when the son-in-law accidently takes a swig, thinking it's soup or something.
Anyway, that's just me.