Do you believe in karma?

Do you think we have good reason to believe in karma? In Hinduism, karma works because that is how people get reincarnated. But so far as this life is concerned, it seems as if people do, for example, get away with murder. They kill people, and it never gets detected, and they benefit from the crime they commit and die of old age in their beds. We might think they are internally tortured by their own crimes, but I would like to see some real evidence that this is always so. In this life, there is crime without punishment.