N.Y. CPL Law § 270.25

§ 270.25 Trial jury; peremptory challenge of an individual juror.\n 1. A peremptory challenge is an objection to a prospective juror for\nwhich no reason need be assigned. Upon any peremptory challenge, the\ncourt must exclude the person challenged from service.\n 2. Each party must be allowed the following number of peremptory\nchallenges:\n (a) Twenty for the regular jurors if the highest crime charged is a\nclass A felony, and two for each alternate juror to be selected.\n (b) Fifteen for the regular jurors if the highest crime charged is a\nclass B or class C felony, and two for each alternate juror to be\nselected.\n (c) Ten for the regular jurors in all other cases, and two for each\nalternate juror to be selected.\n 3. When two or more defendants are tried jointly, the number of\nperemptory challenges prescribed in subdivision two of this section is\nnot multiplied by the number of defendants, but such defendants are to\nbe treated as a single party. In any such case, a peremptory challenge\nby one or more defendants must be allowed if a majority of the\ndefendants join in such challenge, or if there is a tie when there is an\neven number of defendants. Otherwise, it must be disallowed.\n