UDALGURI, May 8: Fake currency notes of 500-rupee denomination and 1000-rupee denomination have been under circulation in Udalguri district for quite some time now. Some banks here have been using fake currency detectors but a few notes are under circulation even through the banks themselves. A note was detected in the SBI Udalguri recently. State Government employees who withdrew their salary from the bank recently found a large number of fake notes. A school teacher got a forged thousand rupee note when she went to withdraw her salary recently.