Raymond is right - Reasonable Cause to Doubt Collectibility (RCDC) exception hold would be applicable, no $100 next day availability required, notice to depositor is required. For the RCDC exception, the notice does have to specify why there is reasonable cause, but one available option is to indicate that the bank has confidential information that leads it to have doubts about the collectibility. On the customer's copy of the notice, you do not need to specify what that confidential information is, but on the bank copy (which you must retain for 2 years), you are required to detail what specific confidential information led you to doubt the collectibility (in this case, the fact that the customer was suspected of check kiting because...). You don't need to specifically tip of the customer that you suspect them of check kiting, though.
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Jim Bedsole, CRCM, CBA, CFSA, CAFP
My posts - my opinions