The latest Bloomberg Businessweek probes U.S. Supreme Court Justice Antonin Scalia‘s approach to oral arguments during the course of the Obama administration.

In the January EPA case, Scalia directed his fire at Justice Department lawyer Malcolm Stewart, who was defending the agency’s use of administrative compliance orders to stop landowners from violating environmental laws. Some of the orders require property to be restored to its previous state. When Stewart argued that people and companies could seek to change any “infeasible” EPA requirements, Scalia made his contempt clear. “Well, that’s very nice,” he said. “That’s very nice when you’ve received something called a ‘compliance order’ which says you’re subject to penalties.” The court unanimously ruled against the agency in March, giving property owners more power to challenge the compliance orders in court.

At one point during the three days of oral arguments in March over Obama’s health-care law, Justice Dept. lawyer Edwin Kneedler said the justices should look at “the structure and the text” of the statute in considering whether the entire law must be struck down if the requirement to buy insurance was declared unconstitutional. Scalia pounced. Being forced to read the phone book-size law would be a violation of the Eighth Amendment’s ban on cruel and unusual punishment, he cracked, “You really want us to go through these 2,700 pages?” Scalia all but declared he’d vote to invalidate the whole law, not just the insurance mandate. “My approach would say, if you take the heart out of the statute, the statute’s gone,” he said.

Scalia’s admirers say he plays a critical role as one of the court’s strongest defenders of individual liberties. He “goes right to the heart of the weakness of the advocate who’s in front of him,” says Ilya Shapiro, a senior fellow at the Cato Institute in Washington, which advocates smaller government. By staking out a forceful position on health care, Shapiro says, Scalia was trying to “express his exasperation with the government’s assertion of power.”

Doug Kendall, president of the liberal Constitutional Accountability Center in Washington, which supports the administration on health care and immigration, takes a less generous view. Scalia has become a “partisan cheerleader,” he says. “I can’t think of a serious question that he posed in either argument suggesting that he was open to have his mind changed.”

If you enjoy Scalia’s rapier wit, you might appreciate a 2004 book of some of his most well-known dissents.