Cecil the lion - if the US were to prosecute this, what would the legal basis be?

Following news that the U.S. Fish & Wildlife Service was seeking to question a Minnesota dentist who has been linked to a high-profile lion-poaching case in Zimbabwe, Africa, observers wondered what the legal basis might be.

There is speculation that American officials may be looking for possible violations of the Lacey Act, reports Reuters.

If so, any potential prosecution would likely be an uphill battle, experts say, since the connection between the U.S. statute and illegal hunting activities in foreign countries is tenuous at best.

Article here (aba journal).