42 U.S. Code § 3756 - Reserved funds
(a) Of the total amount made available to carry out this part for a fiscal year, the Attorney General shall reserve not more than—
$20,000,000, for use by the National Institute of Justice in assisting units of local government to identify, select, develop, modernize, and purchase new technologies for use by law enforcement, of which $1,000,000 shall be for use by the Bureau of Justice Statistics to collect data necessary for carrying out this part; and
(b) Of the total amount made available to carry out this part for a fiscal year, the Attorney General may reserve not more than 5 percent, to be granted to 1 or more States or units of local government, for 1 or more of the purposes specified in section 3751 of this title, pursuant to his determination that the same is necessary—
to combat, address, or otherwise respond to precipitous or extraordinary increases in crime, or in a type or types of crime; or
to prevent, compensate for, or mitigate significant programmatic harm resulting from operation of the formula established under section 3755 of this title.