It's official, TDLR (Texas Department of Licensing & Regulations) has posted online, the maximum allowed tow fee charged a consumer and important information regarding the drop fee.
http://www.license.state.tx.us/towing/towingfaq.htm#ppmaximum
With this information, it's asked that law enforcement agencies educate your folks that deal with these issues on a daily basis, being patrol officers/deputies.
To better understand the drop fee charge requirements, use this video as a reference tool, to educate your LE agency and the public.
http://texastowingcompliance.com/media/texas_towing_with_audio.wmv
These continuing abuses will be stopped when everyone is on the same page of enforcing the law, Occupation Code 2308.