>> sure, deputy city attorney, john gibner. the affordable care act has -- includes some language that states that it does not pre-empt local and state laws like the health care security ordinance. in termser of other questions that have arisen, based on the federal guidance we've received to date, there's no indication that the health care security ordinance is preempted or otherwise adversely affected by the affordable care act and as you subjecting earlier, supervisor campos, the local law complements in many ways the affordable care act. >> thank you, i just want the hear it from the horse's mouth, if you will, because i want to make sure that everything's on the table. yes, supervisor cohen? >> thank you very much, so what does reetcher -- pre-empt mean, just to be clear? >> basically under the u.s. constitution, federal law is supreme and in many cases, if a local agency or a state adopts a law that directly conflicts with a federal law, the federal law trumps, in other situations, there's a federal law that occupies the