(ABCNews) - Many Internet alcohol vendors are lax at verifying that customers are of legal age, making it easy for teens to buy alcohol, according to a new study. Researchers at the University of North Carolina at Chapel Hill asked eight volunteers between the ages of 18 and 20 to attempt to purchase alcohol from 100 of the most popular vendors using prepaid gift cards. Nearly 60 percent of companies selling alcohol online made little, if any, effort to verify customers’ ages. Of 45 successful orders, 51 percent didn’t use any type of age verification.