WASHINGTON — The Treasury Department's program to negotiate and sell billions of dollars of warrants received from banks that got government aid could favor some financial firms over others, a government watchdog said Tuesday.

Neil Barofsky, the special inspector general for the $700 billion Troubled Asset Relief Program, said in a report that the lack of documentation has made it "impossible" for his office to determine why Treasury accepted bids for some institutions, but rejected similar bids from others. The watchdog entity is also unable to verify whether decisions surrounding warrant offers were "consistently or objective across all institutions."

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