Yes, in order to comply with CFTC 1.25 (which is a Federal regulation), clearing firms must ensure proper segregation of customer funds. However, there is no guarantee that every registered firm will always act appropriately until they are caught. However, the regulators are certainly doing their best to audit clearing firms to ensure (especially in the wake of the recent scandals) that the remaining clearing firms are strictly adhering to the regulations, including customer protection rules.