What is the test for whether a suspect has invoked his right to counsel?

Can a police officer continue to question a suspect after the suspect has invoked his right to counsel? (California, United States of America)

Is a defendant's ineffectual request for counsel in a Sixth Amendment context coincidentally invoked his Fifth Amendment right to have counsel present at any interrogation? (California, United States of America)

What is the effect of a police officer's lack of knowledge that a suspect had previously invoked his right to counsel? (California, United States of America)

If counsel discovered that the burglary had been reduced to a misdemeanor, and lodged an objection below, would counsel have discovered that counsel had discovered that Counsel had discovered it was a misdemeanor? (California, United States of America)

What is the difference between a defendant's absolute right to counsel and his unqualified constitutional right to discharge counsel if he pleases and represents himself? (California, United States of America)

What are defendant's rights regarding counsel, counsel and Boykin/Tahl rights? (California, United States of America)

If a suspect waives his Miranda right to remain silent or counsel during an interview, can the police force continue to question the suspect? (California, United States of America)

Does a suspect who has received and understood the Miranda warning, and has not invoked his Miranda rights, waives his right to remain silent by making an uncoerced statement to the police? (California, United States of America)

Does Counsel's statements imply that Counsel never stated whether a witness's statement was made in connection with the matter on which counsel represented her? (California, United States of America)

How have courts interpreted the Miranda rights of a suspect who waives their right to counsel? (California, United States of America)