WASHINGTON (AP) — A Colorado company that was recently snared by congressional investigators for lax medical testing standards is closing its doors. Coast IRB says it will halt work on roughly 300 clinical trials involving thousands of patients and transfer them to other companies. The Colorado Springs-based company has been at the center of debate about rules governing human testing following a congressional hearing last month. Companies like Coast IRB are supposed to oversee patient safety in clinical trials. But federal investigators were able to get Coast IRB's approval for a risky procedure that would have involved pouring a liter of a product into a woman's stomach after surgery. Two other companies approached by investigators rejected the proposal.