Guilty Until Proven Innocent?

Random Sobriety Checks/Drug Testing.. more unconstitutional violations of civil liberties, courtesy of millions of emotional mothers (http://www.madd.org/madd_programs/1229).  Guilty until proven innocent?

Woman arrested at a Sobriety Checkpoint.
http://www.youtube.com/watch?v=29AK3Iw01rQ

"The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized."  The 4th Amendment of the Bill of Rights

How can this get more plain? Apparently, even the fucking supreme court agrees.
http://www.progress.org/drc44.htm

Here's some guy on youtube complaining about it.  Some of you might find this interesting.  If not, just ignore.
http://www.youtube.com/watch?v=0-YKOupojas

>>2
Agreed, MADD is the worse
No one fucking cares if your kid died, just because your kid died, got raped, or died from a overdose doesn't mean you should take away rights from people who are practical and smart.