Final answer:
The Fifth Amendment guarantees due process of the law and protects individuals from self-incrimination and double jeopardy.
Step-by-step explanation:
The guarantees that prevent individuals from testifying against themselves and being tried for the same crime twice are provided by the Fifth Amendment of the United States Constitution.
This amendment protects the rights of individuals in criminal cases, including the right to due process, indictment by a grand jury for capital crimes, and the right not to testify against oneself (the right against self-incrimination).
The Fifth Amendment also ensures protection against double jeopardy, which means that someone who has been acquitted of a crime cannot be prosecuted again for the same offense. However, there are exceptions to this rule - for example, the federal government can try someone for violating federal law even if they have been found not guilty in a state or local court.
Overall, the Fifth Amendment guarantees fairness in the legal process and safeguards individuals from being forced to incriminate themselves or being subjected to multiple prosecutions for the same crime.