Technology to block phones in cars isnt foolproof

Many parents would love to be able to give their teenagers a cell phone that couldn't be used while driving.

Now some inventors say they have come up with ways to make that possible, but they appear to be relying on wishful thinking.

Check it out here:
http://www.washingtonpost.com/wp-dyn/content/article/2009/01/18/AR2009011801098.html?wprss=rss_technology