Let me caution everyone who reads this by stating that It has been a while since I have reviewed 6th Amendment jurisprudence. If I remember correctly, a person has the right to have counsel present at all "critical moments" in a proceeding. However, I don't believe a line up to be a "critical moment." In other words, I don't believe a person has a constitutional right to have an attorney at a line up. Regardless, such a right would emanate from the 6th Amendment.
The Sixth Amendment guarantees the right to an attorney in the United States.
The Sixth Amendment guarantees the right to a speedy trial in the United States Constitution.
The Sixth Amendment to the United States Constitution guarantees the right to an impartial jury in criminal cases.
The sixth amendment to the United States Constitution guarantees that in all criminal prosecutions the accused shall enjoy the right to a speedy and public trial by an impartial jury. The right to have an attorney.
The Sixth Amendment of the United States Constitution guarantees the right to a speedy and public trial.
Ostensibly the Constitution, but it has been superseded by Capitalism now.
Article IV (A+LS)
The Thirteenth Amendment to the United States Constitution guarantees freedom from slavery in all 50 states.
The Bill of Rights are the first ten amendments to the Constitution of the United States. These ensure the constitutional guarantees of the people.
Article IV (A+LS)
Government in the United States is limited and the Constitution's guarantees of personal freedom is a chief example. Each guarantee is either outright prohibition or a restriction on the power of government to do something.
The Sixth Amendment to the United States Constitution guarantees the right to a lawyer for individuals accused of a crime.