Everything changed after the terrorist attack on 9/11/2001. Our country went into chaos, questioning and accusing innocent people, enhancing security policies, etc. No one trusted anyone. It is because of this lack of trust that the government decided to add more strict forms of security, especially in airport security.
Actions like these can be seen in Cory Doctorow's, Little Brother when the Department of Homeland Security (DHS) puts surveillance systems all over San Francisco.
In cases where the government has tried to implement laws that promote the safety of its citizens, many people have lost Constitutional rights in the process. For more information, click on one of the links listed above.
