It's a little too late for all of this, don't you think?" he said. He spoke the coarse Kottayam dialect of Malayalam. He stared at Ammu's breasts as he spoke. He said the police knew all they needed to know and that the Kottayam Police didn't take statements from veshyas or their illegitimate children. Ammu said she'd see about that. Inspector Thomas Mathew came around his desk and approached Ammu with his baton.
"If I were you," he said, "I'd go home quietly." Then he tapped her breasts with his baton. Gently. Tap tap. As though he was choosing mangoes from a basket.... Inspector Thomas Mathew seemed to know whom he could pick on and whom he couldn't. Policemen have that instinct. (1.55-56)
Thomas Matthew sexually harasses Ammu by tapping her breasts, showing that since he's a man, he's automatically more powerful than she is. Then he shows her what kind of woman he thinks she is by bringing up her "illegitimate" children. Talk about a nasty interaction.