Attorney General Jeff Sessions’ “zero tolerance” policy on immigration across America’s southern border was designed to have consequences. But new statistics uncovered by Reuters reporter Mica Rosenberg show the effect of prosecuting every border-crosser is separating migrant families in enormous numbers. How enormous? Before zero tolerance families were separated at a rate of about 100 a month. But – in the only numbers ICE has made public – in 2 weeks in May 638 families were broken apart. And reuniting them after deportation is not easy nor always quick.