With Amazon.com and similar online shopping sites, terrorists, disgruntled employees or anyone who wishes to attack your organization, are merely one click away from receiving the components of a weapon of mass destruction.
Most cases are not in the news due to ongoing FBI proceedings, but the below example was a particularly visible case a couple years ago of Khalid Ali-M Aldawsari, who was eventually sentenced to life in prison for being one chemical away from building a bomb.