I know that this probably won't give you a great deal of comfort, Belinda, but I found this while searching for US experts on Satanism. LE and the Catholic Church in Italy are addressing the growing problem and have brought in an expert on Satanism for consultation. Yes, he happens to be a priest:
http://www.tldm.org/News10/satanismInItaly.htm
"One of the Vatican's specialists on Satanism and the occult,
Don Oreste Benzi, has been brought to work with police.
He told the Sunday Telegraph that the natural curiosity of young people meant they were particularly attracted to the occult, and drugs were also used to influence and manipulate them.
"We will provide the units with priests who have experience in the field of devil worship and the occult," he said. "They will help the SAS to combat this problem, which is growing at an alarming rate across Italy. Already in the past we have seen churches desecrated and lives taken away through devil worship.
"We are not just talking about murders but the psychological grip that these sects have on young people, especially taking them away from traditional social values and exposing them to all sorts of horrors.
"We estimate that there are at least
8,000 Satanic sects across the country with more than 600,000 members and the numbers are growing all the time. That is why the church is more than happy to help."
and
"
Many of the new wave of Satanists in Italy indulge in a potentially lethal blend of black magic, hard drugs, sex and heavy metal...."
more at link with descriptions of recent cases
I'll keep searching.