The term showing of interest, as used in this Chapter, shall mean a designated percentage of public employees in an allegedly appropriate negotiating unit or a negotiating unit determined to be appropriate, who support the filing of a petition or a motion to intervene. Any showing of interest must be accompanied by a declaration of authenticity as set forth in section 201.4(d) of this Title. A showing of interest may also be used to determine whether an employee organization is entitled to certification without an election pursuant to section 201.8(c)(1) of this Chapter.
N.Y. Comp. Codes R. & Regs. Tit. 4 § 200.13