How did the events of Columbine change Law Enforcement?  What is in place to prevent

How did the events of Columbine change Law Enforcement?  What is in place to prevent such events in the future.  What warning signs were present in Kliebold and Harris that we should tune in to?  You can include “in your own words, a description of what happened but remember we are all reading the same book so that is really not the focus.  Law Enforcement did indeed change that day, how, why and where do we go from here? Remember the paper needs to be 3 FULL pages in length.  Double spaced.  Times New Roman.  Size 12 pitch.  1” margins