Only if you are eating at unreliable restaurants. Any restaurant with a reliable hechsher has a mashgiach making sure that produce subject to infestation is checked according to guidelines. Ask in the kitchen before you eat. Restaurants have lost their hechsher for non compliance. Some kashrus agencies such as KCL will only allow restaurants to use bagged lettuce with a hechsher and wil not allow checking at all.
Very true. I sometimes see the mashgiach sit and check the produce. Sometimes Ill ask for something like broccoli and the waiter will say that the mashgiach doesn’t allow it….
