police seized rafi , 10 , and dvora , 6 , in a maryland park on sunday and their parents say they were n't reunited by cps for hours .
scientists danielle and alexander meitiv believe in ` free range parenting ' meaning the children are afforded total independence from infancy .
the meitivs were found guilty of neglect in march . after sunday 's incident they were forced sign a paper pledging not to leave them unattended .