So for decades, scientists have been working on ways to screen for cancers using a simple blood draw rather than a painful ... has been around for more than 20 years," he said.

The practice of drawing blood has changed very little over the decades. It looks about the same now as it did 50 years ago. That process ... to have a good sample in order to have meaningful ...

order blood drawn from an unconscious person suspected of driving under the influence of alcohol. The Fourth Amendment generally requires police to obtain a warrant for a blood draw. But in a 5-4 ...