The 4th Amendment declares that citizens have a right to "their persons, houses, papers, and effects, against unreasonable searches and seizures" and that no warrants may be issued without a statement of probable cause "particularly describing…things to be seized."
The 5th Amendment says the accused criminals shall not be "deprived of life, liberty, or property, without due process of law."
The 6th Amendment ensures that people accused of crimes must be "informed of the nature and cause of the accusation,"
The 8th Amendment forbids the government to impose "excessive fines" or "cruel and unusual punishments."
Opponents of the change have little more than 'the ends justify the means' as a counter argument.