[Liz]

The SEC has requested data from 1998 and 1999 in three categories: audit trail data, which match "buy" and "sell" prices against the tape that records all trades; systems orders, which come through the central order system; and quote-assisted time stamps, which show the time an order was presented to a specialist, sources said.

See.......that's why you should never leave a paper trail.........(/sarcasm).

[razorback-bert]

the amount investors lost from specialists trading ahead of orders -was estimated at $150 million

Chump change.