Indiana Code Title 34. Civil Law and Procedure § 34-30-6-2

(1) whose act or omission caused in whole or in part the emergency and who would otherwise be liable for the emergency;

(2) whose act or omission constituted gross negligence or willful or wanton misconduct;  or

(3) who receives payment, or is an employee of a person who receives payment, for services rendered in connection with the emergency, from a person whose act or omission caused in whole or in part the emergency.  Payment does not include reimbursement for expenses.