I think the answer is the supreme court.
To make officially valid or consent to.
Answer:
It breaks the Fourth Amendment of the United States Constitution.
Explanation:
The Fourth Amendment is about the right for privacy and freedom, and it protects the citizens against unreasonable searches and seizures. It protects the individual inside their homes and, most recently, in the use of tecnologies. There is a need to have a search warrant granted by a judge to investigate insides people houses and phones.
The GreenDuds company is acting against the law when it allows the investigators to use "whatever means necessary", since it assumes that they will probably break phone records not by doing a claim to a judge, but by unlawful means, such as hacking or paying someone in the phones company to provide those informations.