I have been a member of this site for years and have also operated my own site on the side
www.speclass.com. My site is geared toward teaching law enforcement officers techniques to communicate in Spanish with a limited Spanish vocabulary (cognates, plug-and-play sentence starters, and interview techniques).
I have had over 2000 students from across North America. After receiving multiple requests to do so, I finally published a book with the techniques:
www.amazon.com/Functional-Police-Spanish...776/ref=pd_rhf_p_t_1