So in a blind panic they duct taped her mouth, tasered her numerous times, injected her with lethal amounts of narcotics, dug up an accomplice, and took their car out into the desert for a botched case of arson.
That's more than a moment of panic. There's so many crimes just in that that they'll be sitting in jail for years & years.
Even if by some fluke the judge tosses their confessions, of which there are two from different police departments, the state also has the testimony of their friends who they gave the taser too. Their testimony is brutal.. They'll fry just from that. Craig & Kelly told them all the nasty details.
Add in the testimony of the accomplice, who has already cut his deal, and the Titus' are toast.