The cornerback market is continuing to thin out. Earlier today Richard Marshall agreed to a one-year deal with the Arizona Cardinals, and now Chris Carr is no longer a free agent as well.
One more CB off the market: Ravens reached agreement with cornerback Chris Carr on a four-year deal.less than a minute ago via UberSocial for BlackBerry 
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Adam Schefter
AdamSchefter
With fewer and fewer options available at cornerback, it will be interesting to see what happens with Chris Houston going forward. Teams still in need of cornerback help could potentially target Houston, but at the same time, he might not get as much money as he once hoped. It doesn't appear teams consider him to be on the top tier of free agent CBs, so perhaps if the market doesn't result in him getting a deal to his liking he could end up returning to the Detroit Lions when all is said and done.