The right of individuals to understand and be understood in judicial procedures is enshrined in several international and national legislative instruments. This right is often exercised through the intervention of translators and interpreters whenever individuals do not speak or understand the language of the country in which they are a party in a judicial procedure. In order to make such a right effective, legislation has moved a step forward and established the need to guarantee quality translation/interpreting. One mechanism provided to ensure quality is training of police and judicial staff to effectively work with interpreters. This chapter describes a 20-hour training course taught to a mixed group of Spanish police officers.