Welfare fraud investigators have taken steps to seize Octomom's bank records and other documents that may prove she's been stealing taxpayers' money ... and what they find could land her in prison.
Welfare fraud officials obtained a search warrant to seize Octo's financial and employment records -- because they smell a rat.
TMZ broke the story ... the L.A. County Dept. of Welfare Fraud Prevention and Investigation (WFP&I), has been investigating Nadya Suleman after getting a tip that she was collecting welfare in 2012 ... when she grossed more than $200,000.
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