Oregon passed on a law on that subject in 2011 because of this cult.  

Unfortunately, it only gets invoked after someone knows they are ignoring the health requirements of one of their children or after one of them dies.

"The state medical examiner's office reported that during the past 30 years more than 20 children of church members had died of preventable or curable illnesses." 

http://www.oregonlive.com/oregon-city/index.ssf/2010/07/judge_orders_state_custody_medical_care_for_faith_healers_child.html