the boston bombing. security at churchill downs now understandably tightened. >> the marathon bombing occurred and we were on the phone immediately with our law enforcement partners and had meetings the next day. we had to move really quickly if changes were warranted we had to get the word out pretty quickly. >> reporter: changes were made. in addition to the ban on backpacks in place since 9/11 the new security restrictions include no camp carders, cans or coolers of any size. and women with purses larger than 12 inches will have to leave them at home for the big races. and the estimated 160,000 people going through the gates can expect to have more thorough bag inspections, and magnetic wand searches. >> we hope not a single person that gets to the gate is surprised and trying to bring in something not allowed. >> 1200 federal, state and local officers were also be out in force, an increase of about 100 since the bombing. >> basically just areas of