Auto mechanics would have to get certified to handle medical waste.
Urine is not flamable, (at least I don't think it is, never actually tried it myself) so it would be safer if you had to transport quantities of it from places where an abundance is produced to where there is a larger demand.
'09 RL Ruby Red Manual
3rd brake pulser-seq'l tail lights
Retracting motorized front license
HID low beam & fogs
DDM Works - Charge Tubes,Cross Bay Brace,Tunnel Brace,Center Console,Fender Trim,Sway bars,Drilled Rotors,Hawk pads