Many NFL quarterbacks have their jerseys shortened or elasticized for comfort. And for the new Nike-made NFL jerseys, there is also a specific manner in which the lettering is sewn into the jersey, Kinunen said.
Experts in the sports memorabilia industry, including one that has worked directly with NFL teams, say it is a tedious process that involves comparing photos and videos that captured degradation to the jersey during the game. They also compare the jersey to team-issued serial numbers and other player-specific customizations that authentic jerseys typically have.
Major League Baseball has taken safeguarding game-used materials to an even higher level since beginning its authentication program with Authenticators,NFL Jerseys China, Inc. in 2001.
BOSTON (AP) — Now that authorities believe they have recovered the jersey stolen from Tom Brady's locker following the Patriots' Super Bowl win last month, the next step will be determining whether it is in fact the MVP quarterback's missing grass-stained garment.
Once an item has been authenticated, it is affixed with a hologram and unique serial number that is searchable in the league's database located on MLB.com.
In today's digital age, that process is a lot easier and more dependable.
Brady's jersey went missing from the Patriots' locker room after their Super Bowl win over the Atlanta Falcons Feb. 5, setting off an investigation that stretched from Boston to the Mexican border.
Most of the authentication Meisel's company is asked to perform involves a jersey coming from the hands of league official from a player in the locker room. But he said even in those cases, a process called photo matching is used.
"It's a crazy story," he said. "If I had to guess jerseys have been stolen out of locker rooms for 100 years. But the value wasn't there. Now it was a nationwide manhunt because of the value associated with it."
"In the Brady jerseys case, you literally have millions of visuals for the Super Bowl," Meisel said.
His company was once asked by a collector to authenticate a jersey that an auction house was purporting to have been worn by Boston Bruins great Bobby Orr the night the Bruins captured the 1972 Stanley Cup.
"Every jersey is like a fingerprint. No two jerseys are alike," said Barry Meisel, president of the MeiGray Group, which has authenticated game-worn sports memorabilia since 1997.  "They're hand-stitched, full of dirt, mud, helmet stains, turf skids and burns. When you look at jersey after a game it's unique."
MeiGray Group has authenticated jerseys for the NBA, NHL, USA Hockey and the NFL's Redskins and Chargers.
NFL spokesman Brian McCarthy declined Wednesday to discuss the authentication process due to security reasons, writing in an email only "there are a number of procedures we have been using." The FBI also has not commented on the methods it is using.
In photo matching, an authenticator would utilize all the available photos and videos that captured images of the garment and compare stains,Cheap Jerseys From China, tears,Discount NFL Jerseys, and abrasions the garment undergoes over the course of a game.
Troy Kinunen, president of Memorabilia Evaluation and Research Services, said his company evaluated Babe Ruth's 1932 "called shot" jersey for a private collector. Authenticators used photos of old jerseys Ruth had worn to prove it was the real thing.
"The mesh holes create a pattern.you can examine application of how it's sewn on in conjunction with mesh holes," he said.

There are also both league- and team-specific qualities that distinguish NFL game-worn gear. Meisel said he has never worked with the Patriots, but said teams he has worked with employ unique serial numbers that are placed on different parts of their uniforms.
For MLB jerseys, an authenticator is stationed in the clubhouse and witnesses an item going from the player and into the laundry basket.
Kinunen said he expects the Brady incident to bring even more awareness to the authentication industry,NFL Jerseys Wholesale.
Working with U.S. investigators, Mexican authorities obtained a warrant to search property of Martin Mauricio Ortega, a tabloid journalist who colleagues say went to the game with a media credential, but bragged he was there as a fan. Authorities recovered the jersey,Wholesale MLB Jerseys, along with another Brady jersey that disappeared after the 2015 Super Bowl. A helmet belonging to a Denver Broncos player — possibly Von Miller — was also discovered. Ortega quit his job two