This is what I read on page 17 NY Hunting & Trapping guide (2010-2011)
Modified Crossbow Permit
This permit allows qualified people to hunt big or small game with a crossbow that has been specifically modified with a device that only allows it to be discharged (fired) by means of a breath tube. This permit does not allow the use of an unmodified crossbow.
To qualify for a Modified Crossbow Permit, a person must be permanently physically unable to hold or draw a legal bow or to fire a legal bow that has been modified to hold and release the string.
If a person can pull the trigger on a gun, he or she will not qualify for a Modified Crossbow Permit.
The last I heard the Gov. haven sine the bill for the crossbow