restrictions on innovation or are there broader risks and then following up on that, going to professor linley's point about a rule-based regulatory system and given the slight mismatch and speed between which the legislation has passed and technology develops. how can legislation develop that is flexible enough to talk about some of the issues that we talked about and others that will arise in the future. >> and i think this is a very hard problem and as richard suggested and the last question, it's a hard problem any time you have to intervene and you can't avoid intervening at some level. to me, by and large, and i think this is in line with what richard is saying. we're just agreeing all of the time. >> you're agreeing with me. >> i disagree with you on vaccine threats. >> the -- it seems to me right for the reasons you suggested we are generally speaking better served with common law and flexible rules than detailed legislative parameters in part because congress can get them wrong because they don't understand or congress can get them wrong because they have a vested interest because they