We would like you to assess the QUALITY of each of the following argument (discussing Death Penalty) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of death penalty. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of death penalty.

Q: Some have claimed that the death penalty is culturally biased towards black people.

A: Valid
****
Q: Life incarceration will never let him kill again, and its cheaper.

A: Valid
****
Q: Neither actually, merely a casual inference that just because one doctor questions his own ethics does not mean all do, nor does it represent anything more than an isolated incident.

A:
Invalid
****