Using the anti vaxx movement as an example, from people posing as medical doctors as was the case with a Measles outbreak in a Minnesota Somali community, to handing out these flyers with candy and syringe pens to children on Halloween, should the willful distribution of false medical information result in fines and imprisonment if proven? And for a few points of clarification:

The first amendment does not guarantee you free speech to say anything you want, anywhere you want, it only protects you from the government suppressing that speech.

It's also important to note that Wakefield's study was only conducted on 12 people and he lost his license and was banned from practicing medicine for falsifying the results of his study.

If it doesn't load all the way (the citations are at the bottom of the infographic), here is a link to the full article featuring it: http://www.upworthy.com/it-took-studying-25782500-kids-to-begin-to-undo-the-damage-caused-by-1-doctor?c=ufb1 And here is a link to 107 studies that find no link between vaccines and autism. It's from a blog, but each link works: http://justthevax.blogspot.com/2014/03/75-studies-that-show-no-link-between.html?m=1