Despite Ron being more than willing to allow the Ministry to search his apartment, Harry could not officially start the investigation until he was given the warrant the next day. Ron wanted to start the investigation behind the Ministry's back to look for Hermione, but Harry stopped him, saying they could start to search her whereabouts in another way, like with her wand. A cold chill passed over Harry when they were unable to trace her wand's signature and when he thought to work with the muggle police department to track her phone, he got the same results. Hermione was in danger.