Counselling for 'psychological trauma': outcome studies?

G’day

Can anyone let me know whether there have been any well-conducted outcome studies of counselling people who have been through ‘traumatic’ experiences? Has it been shown to do any good? If it were a drug, would the FDA approve it?

And have there been comparison tests between counsellors taking different approaches? What is the most effective counsel to give a person who is in danger of PTSD?

[Note: I tried posting this question a few hours ago, but my previous post seems to have been eaten.]

Regards,
Agback