[cylon13]

Why would you expect a law professor to be an expert in avoiding being framed?

[jliptzin]

They might have the resources (experience, connections, money) to mount a successful defense that the average person wouldn't have access to?

[rovr138]

So, not avoid being framed, but defending against it successfully, which they did.

[jliptzin]

Not before losing his career and having to flee his country, probably because his reputation was dragged through the mud. News of the acquittal doesn't travel nearly as far as the initial arrest - see sibling comment below.