From Ammoland:

The whistleblower only identified as Joe told CBS that multiple employees filed for and received “LEAP” pay even though they did not qualify for the bonus scale. LEAP stands for “Law Enforcement Availability Pay.” It is meant for paying law enforcement officers for on-call hours where they are required to work long and odd hours. The pay is not meant for non-law enforcement employees of the ATF, and non-LEO is expressly prohibited from collecting the income. The ATF pays a rate of 25% over base pay. If an employee makes a base salary of $100,000, that officer could be paid $125,000 with LEAP pay.