Terms for subject Intelligence and security services containing reliable

English	Russian
a source who has furnished reliable information	источник, предоставлявший надёжную информацию (financial-engineer)
a source who has furnished reliable information in the past	источник, ранее предоставлявший надёжную информацию (financial-engineer)
absolutely reliable document	абсолютно надёжный документ (Alex_Odeychuk)
have reliable information	обладать надёжной информацией (Alex_Odeychuk)
reliable source	надёжный источник
tested and reliable agent	надёжный и проверенный агент (financial-engineer)
tested and reliable asset	надёжный и проверенный агент (financial-engineer)