The world's leading autograph authentication experts have been pooled together by PSA/DNA to examine and certify your previously signed autographs. That's not all. PSA/DNA uses state of the art technology to protect your genuine valuable collectible from any foul play. Once an item is deemed genuine, the item is marked with invisible DNA-laced ink — naked to the eye but verifiable through a specially calibrated infrared laser. In addition, a Certificate or Letter of Authenticity (LOA) that ties our service with your genuine autograph will accompany your item. With our unique alphanumeric number, any interested party can verify authenticity online even as items change hands time after time.