Scahill's allegations are being confirmed by the Spanish torture investigation. Indeed:

"Up to 15 people attempted to commit suicide at Camp Delta due to the abuses of the IRF officials," according to the Spanish investigation.

One particular incident shows how brutal the IRF interrogators are:

In January 2003, Sgt. Sean Baker [an active-duty U.S. soldier and Gulf War veteran] was ordered to participate in an IRF training drill at Guantánamo where he would play the role of an uncooperative prisoner. Sgt. Baker says he was ordered by his superior to take off his military uniform and put on an orange jumpsuit like those worn by prisoners. He was told to yell out the code word "red" if the situation became unbearable, or he wanted his fellow soldiers to stop.

According to sworn statements, upon entering his cell, IRF members thought they were restraining an actual prisoner. As Sgt. Baker later described:

They grabbed my arms, my legs, twisted me up and, unfortunately, one of the individuals got up on my back from behind and put pressure down on me while I was face down. Then he -- the same individual -- reached around and began to choke me and press my head down against the steel floor. After several seconds, 20 to 30 seconds, it seemed like an eternity because I couldn't breathe. When I couldn't breathe, I began to panic and I gave the code word I was supposed to give to stop the exercise, which was 'red.' … That individual slammed my head against the floor and continued to choke me. Somehow I got enough air. I muttered out: 'I'm a U.S. soldier. I'm a U.S. soldier.'

Sgt. Baker said his head was slammed once more, and after groaning "I'm a U.S. soldier" one more time, "I heard them say, 'Whoa, whoa, whoa,' you know, like … he was telling the other guy to stop."

According to CBS:

Bloodied and disoriented, Baker somehow made it back to his unit, and his first thought was to get hold of the videotape. "I said, 'Go get the tape,' " recalls Baker. " 'They've got a tape. Go get the tape.' My squad leader went to get the tape."

Every extraction drill at Guantanamo was routinely videotaped, and the tape of this drill would show what happened. But Baker says his squad leader came back and said, "There is no tape."

The New York Times later reported that the military "says it can't find a videotape that is believed to have been made of the incident." Baker was soon diagnosed with traumatic brain injury. He began suffering seizures, sometimes 10 to 12 per day.

"This was just one typical incident, and Baker was recognizable as an American," says Horton. "But it gives a good flavor of what the Gitmo detainees went through, which was generally worse."

If they did that to a U.S. soldier during a training exercise, one who was given a special code word to have the interrogation stop, what they do to actual detainees must be much worse.

The torture by IRF teams is continuing under the Obama administration. In fact, it is actually getting worse:

The Center for Constitutional Rights released a report titled "Conditions of Confinement at Guantánamo: Still In Violation of the Law," which found that abuses continued. In fact, one Guantanamo lawyer, Ahmed Ghappour, said that his clients were reporting "a ramping up in abuse" since Obama was elected.

And see this.

Note: I don't know whether or not torture is continuing in conjunction with interrogations. This essay focuses on a different type of torture. See this.