Sorry LJ, I don't get your logic either. Either a rape suspect is at large and they know where, or they wait and hope he hasn't done a runner in 6 hours.... Tell me, if it was your daughter, and they had the name given by someone who claimed to be at the scene of the crime, rape, murder and the police didn't go question the accused pronto... you wouldn't let all hell break loose with the police the next day if they had decided to wait till they had breakfast and espresso?
Please see my immediately previous posts. I argue that there was VERY LITTLE AND IN FACT ALMOST NO risk that Lumumba would either flee or commit another offence between the hours of 6am (the earliest he could have been approached) and 9am. The police knew that he had no idea that his name was suddenly in the frame (unless the police or prosecutors had tipped him off themselves at some point after midnight that same night). And nobody had been raped or murdered (to my knowledge) in all of the previous five days since the Kercher crime. So if Lumumba HAD raped/killed Meredith, her murder/rape clearly wasn't the kicking off point for a spree killing/raping rampage in Perugia.
HOWEVER, if it makes everyone here feel more comfortable, I'll willingly change my position to this (since it doesn't change my central argument): The police could have gone to Lumumba's house AS SOON AS they had seen AK's written statement from 05.45, in order to totally eliminate any risk of "letting a murderer/rapist slip unnecessarily through their hands or letting another girl be raped and murdered".
Two or three officers could therefore have gone to Lumumba's house at 6am - the earliest time possible - and knocked on his door. If he'd refused to answer the door, and they'd believed him to be inside, they could have radioed for backup, forced his door open, and arrested him, since his refusal to open the door could correctly be interpreted by the police as indicative of some sort of guilt. They could then have handcuffed him inside his own house, and placed him in a police car for transportation back to the station.
If he'd come to the front door in his nightwear, the police could have informed him that he had come to their attention in connection with a serious offence, and told him that they required him to accompany them immediately back to the station to answer questions under caution. If he'd agreed, the policemen could have either waited at his front door while he got dressed etc, or they could have accompanied him inside the house while he did so if they judged that he was either a flight risk or at risk of harming himself or others in the house.
If he'd refused to accompany the police back to the station immediately (and that includes him saying something like "Oh I WOULD come with you right now, but I've got a consignment of beer being delivered at 8 O' Clock. Is it OK if I come to the station at 11.30am?"), they would have again been justified in arresting him on the spot, placing him in handcuffs, and transporting him back to the station.
If Lumumba had gone voluntarily to the station at 6am to answer questions under caution (as in hindsight I believe he would have done), he could have been given the opportunity to account for his whereabouts on the night of the 1st. He could also have been asked about the meaning and significance of the text message. His answers to those questions could have been checked by the police either during the interview, or immediately afterwards (he could have been asked to voluntarily wait while his version of events was checked). In addition, the police could have simultaneously been checking through all the forensic evidence they had at this point, to see whether any of it implicated Lumumba. He could have been asked to supply samples of his blood, fingerprints, footprints and hair - all voluntarily. An innocent man would have had no problem complying with that voluntary request. Had Lumumba refused to supply such samples, that in itself would, in my view, have constituted sufficient suspicion to move to arrest at that point.
My overarching point is this: the police didn't have to ARREST Lumumba in order either to get him off the streets and into the station, or to enable them to question him about the crime. He could (and, I believe WOULD) have done all these things voluntarily if he'd been given the chance. And if he hadn't complied, or had exposed himself through his answers under interview, he could and would have been arrested at THAT point.