has a restricted communicable disease or disorder or is a drug abuser.
Have a machine-readable passport (MRP) that meets certain criteria. For detailed information, see the questions about MRP and e-passport's on the Department of Homeland Security's website.
Plan to remain in the US for 90 days or less. If the traveler wishes to stay in the US for more than 90 days, he must obtain a visa.
Enter the US for tourism or temporary business. VWP entrants may not perform employment for remuneration in the US. For more information on the activities that may be performed as a temporary visitor or in other nonimmigrant visa categories, see Key Nonimmigrant Visa Classifications Chart.
Demonstrate on entry to the US that he has sufficient funds to support himself for the trip's duration.
Statutory authority for the VWP is found in the Immigration and Nationality Act (INA § 217 (8 U.S.C. § 1187)).