Do I Continue SPCA Investigation? Or Allow 'Disgruntled Ex-Employee' to Remain Excuse?

Recently, I broke a story about the SPCA -- which is being funded partially by Ellis County taxpayers -- allegedly euthanizing animals without giving them a muscle-relaxer drug --- which is a requirement under Drug Enforcement Agency guidelines. I didn't and I don't reveal where my source(s) are, nor will I confirm or deny that I've got audio recordings from inside SPCA, but the response from SPCA was what one would expect:
I know how you obtained it, sir, from a disgruntled ex-employee. I assure you, we do everything by the law. So if you feel the need to contact the Sheriff’s office or the commissioner’s court, please feel free to do so.

Our budget is not under constraint, nor do we cut corners when it comes to the welfare of the animals. I am sorry you were misinformed.

Dana White
Executive Director

Of course SPCA would not openly admit to doing what has been alleged by multiple sources, but should that be the end of it? Should this "disgruntled ex-employee" line simply be the stop sign to government-sponsored animal abuse (see Ferris animal shelter problems -- recent ones -- for a look at what "government sponsored" means)?

There's also a plot of land near Rockett (between Ferris and Waxahachie) that has numerous, numerous horses on the property and they are malnourished and some of them are rotting on this land, but the sheriff's office has been notified but no one is investigating...or are they? The horses are still dying...