mr. hinkley's travel to the washington, d.c. area, we continue to fear for the safety of the general public. our thoughts are with all of his victims today. and especially jim brady and his family as they must continue to live with the tragic consequences of the assassination attempt. >> reporter: when jared loughner opened fire in arizona last weekend, he used the pistol to hide a high ammunition magazine, capable of holding 30 rounds. now, those kinds of magazines were outlawed for a ten-year period until 2004, when they let the federal gun control law expire. now, den dennis richardson gives us a look back. >> reporter: assault weapons account for about 1% of all guns in private hands. but in a 21-month period in the year of 1994 and '95, assault weapons counted for 13% of all fatal shootings of law enforcement officers nationwide. 20 of those deaths are guns with high capacity magazines, firing dozens of rounds without reloading. and last month, 3,000 officers and friends turned out for the funeral of the oakland police offi