Bulletproofing is the process of making an object capable of stopping a bullet or similar high velocity projectiles (e.g. shrapnel).In 1887, George E. Goodfellow, of Tombstone, Arizona, documented three cases where bullets had failed to penetrate silk articles of clothing.Another of the grains had passed through two heavy wool shirts and a blanket-lined canvas coat and vest before coming to rest deep in his chest.However, Goodfellow was fascinated to find two shotgun pellets in the folds of a Chinese silk neckerchief around Grounds' neck but no holes or wounds.The National Law Enforcement and Corrections Technology Center tests body armor to assess its compliance with the standards and publishes the results.