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"less likely"

whew, for a moment there I thought it might be true that a suicide attempt was brownie points for the IA division of youth and family services!

Obviously since Casey is home and not in custody it wasn't a suicide attempt over the guilt of murder. You can bet the police questioned him like crazy and apparently he passed again.
Lets look at Noel's time line...She works 10-6 in Nora Springs as a CNA but was home by 6;20 cops called by 6:30. CNAs cannot clock out until the other shift has received report and is on the floor. so at best she wouldn't have clocked out until 6:10. She would have driven straight home at a high speed.
Did she already know something was wrong at home? Was she angry and in a hurry to get there to act out her anger? Wouldn't neighbors had heard her screaming Evelyn's name up and down the halls of the building before police were called?