Almost all kleptomaniacs do.

During an attack they are utterly irresponsible." Drummond was looking at the thing carefully.

Constance turned to Annie Grayson.
"Where's your husband ?" she asked offhand.
"Oh, he disappeared as soon as these department store dicks showed up," she replied bitterly.

She had been watching Constance narrowly, quite nonplussed, and unable to make anything out of what was going on.
Constance looked at Drummond inquiringly.
He shook his head slowly.

"I'm afraid we'll never catch him," he said.
"He got the jump on us--although we have our lines out for him, too." She had glanced down quickly at the little innocent-looking but telltale sphygmomanometer.
"You lie!" she exclaimed suddenly, with all the vigor of a man.
She was pointing at the quivering little needle which registered a sudden, access of emotion totally concealed by the sang-froid of Drummond's well-schooled exterior.
She wrenched the thing off his wrist and dropped it into her bag.