Prior Visa Denial
Since two years have passed since his last denial, hopefully your friend has developed ties to Ireland that will convince a U.S. consular office in Dublin that he intends to return after his stay in the U.S.
"An applicant can influence the (consular office) to change a prior visa denial only through the presentation of new convincing evidence of strong ties," says the State Department.
For more information, visit http://travel.state. gov/visa/frvi/denials/denials_1361.html.