11:33 AM PT -- More info from the Harris County Sheriff's Office ... which says the incident in question took place on June 15, 2017.
"The complaint was thoroughly investigated and all involved parties, including Mr. Sanders, were interviewed by investigators."
"Upon completion of the investigation, evidence and witness statements were presented to the Harris County District Attorney’s Office to determine whether a criminal charge should be filed."
"The Harris County District Attorney’s Office presented the case to a grand jury, which determined on January 9, 2018 that there was insufficient evidence to support a criminal charge.