A CBS affiliate in Greensboro, WFMY2, mentioned Prather in a 2015 piece: DEA Agents Kept Jobs despite serious misconduct.
Another agent, Jeffrey Prather, was fired after admitting he let civilians use “DEA-issued fully automatic weapons” as part of a security training business he had set up, according to merit board records. The board also concluded that Prather, who it said established his own religion, had persuaded “vulnerable and struggling women” to have sex with him “by telling them they would be ‘healed’” if they did.
Prather said the case against him “was a witch hunt.”
As for Todd Callender, I couldn't find anything substantive until I came to this website:
https://narativ.org/2021/09/17/ghost-in-the-anti-vaccine-machine/
Make of it what you will.