I don't believe shoe companies care. They'll hide it if they can, and in most cases, especially one particular shoe company, they can!
I know for a fact that CJ Hunter was going to be permitted to participate in the Olympics even though he had tested positive. His association (husband) with Marion Jones made him too valuable to be popped for PEDS. She was the marketing golden girl at the time. USATF, with extreme pressure from Nike had it all hidden for months until someone leaked it from USATF forcing their hand. A close friend worked for USATF in Indianapolis at the time and told me this several weeks before it was disclosed.
Mary Slaney had her case hidden for months as well. USATF said they needed to await the appeals process, but my friend told me long before it was announced that they were negotiating with the shoe company to disclose, not disclose, hide, or whatever other option they agreed upon.
This was all long ago, so the shoe influence may not be as strong. Orrrrr, it could be stronger than ever. Personally, I don't know but I have little trust in USATF and shoe companies.