Find some info here: Elkhart County, Indiana (IN) Scanner Frequencies and Radio Frequency Reference
And SAFET here: Indiana Project Hoosier SAFE-T Trunking System, Statewide, Multi-State - Scanner Frequencies
The first has backup info for EPD and so forth and the other are SAFET on the statewide system. Note the D in the mode column designates digital transmissions so you will need a digital capable scanner. I'm not cetain but at one time there was a lot of use of encryption on the PD channels.
HP-1 x 2, BCD396XT, BCD396T, BCD996T, PSR600, Pro2035, Pro2035+535, Pro2052, Pro94, Pro97,Pro-2096, R71-A, PCR-100 x 2, PCR1500 and 12 other scanners/recievers.