They asked us to come off rudely , which was needless as we were hardly going to argue . Then a third woman arrived , though she was a real copper and treated us really respectfully and politely . She informed us that she 'd have to take our names because she had stopped us , just for formalities . So we did so , with a laugh and joke , before I said , ' So , common ? '

Based on the preceding passage, answer the following question What leads the speaker to refer to the third officer as a ' real copper ' ?
The speaker believes that real cops hold themselves to a certain standard of behavior