Misuse of state airplanes. State law bars any use of state planes other than for official business. Sanford, according to state documents, used a state plane to ferry family members and to attend political functions, possible violations of state law.
Using expensive airfares on foreign trips. State law requires the use of the most economical travel available. Sanford used more expensive airfare, according to state documents.
Failure to disclose private plane trips. The Associated Press reported Sanford accepted 35 rides on private planes that he did not disclose in his state ethics report, a possible violation of state law. Questions have since arisen about whether Sanford should have paid federal taxes on those plane trips.
Use of campaign funds. Sanford has refused to say publicly why he reimbursed himself more than $1,800 for expenses from his campaign account in the past 18 months. The Ethics Commission could review those expenses.