Limits on testimony of experts witness in med mal case

The other day I mentioned in class that one way in which medical malpractice "reformers" have attempted to limit plaintiffs' claims is by making it difficult for them to find experts willing to testify for them. Here is an example: the Maryland Court of Appeals has decided a case holding that a proffered expert witness in a medical malpractice case was properly prevented from testifying at trial "when the expert devoted annually more than 20 percent of his professional activities to activities that directly involved testimony in personal injury claims." Here is the link to the case. Thanks to the Legal Profession blog for the info.