The Federal Circuit’s decision in Vanda Pharm. Inc. v West-Ward Pharm. Intl. Ltd. (2016-2707, 2016-2708 April 13, 2018) provided some good news on the subject matter eligibility front for innovators and other stakeholders in the personalized medicine space, as discussed in a previous post. So there is some hope for getting issued claims that will withstand a validity challenge under the Mayo/Alice framework. But what about enforcement? How does one prove infringement of claims that require various discreet steps that can, and typically are, performed by separate actors?