Indiana Code Title 24. Trade Regulation § 24-5-27-22

Sec. 22. (a) A provider may not charge any taxes or fees to users of inmate calling services for, or in connection with, intrastate calls, except for the following:

(b) Any:

passed through to consumers for, or in connection with, intrastate inmate calling services may not include a markup, unless the markup is specifically authorized by a federal, state, or local statute, rule, or regulation.