Border Patrol agents are warning that kids as young as 8 are being drugged and smuggled into the US by traffickers posing as their parents or family members " and nobody knows how common the horrifying practice is. Authorities have rescued children caught up in two different instances of such smuggling in recent weeks " including one instance in which the alleged traffickers had birth certificates for multiple kids to whom they weren't related, according to the Border Patrol. Authorities say it's not clear what is happening to the children once they are smuggled into the US " but many are vulnerable to being exploited for child labor and child sex trafficking. "Sometimes we encounter criminal actions so horrendous, they defy human decency," said Gregory Bovino, the Border Patrol chief of California's El Centro sector in the southeast of the state, in response to the case. In one case, border agents rescued a child at the California border who had been "heavily dosed with sleep aids to prevent him from talking" to authorities, Bovino said Friday. Those agents found that the traffickers had birth certificates for more children. Under the Biden-Harris administration, the number of children crossing illegally into the US alone and without relatives has skyrocketed. Thousands of those children have also gone unaccounted for after they've been released to sponsors, who whistleblowers say aren't properly vetted, in the US.