This article relies largely or entirely upon a single source. (October 2013)
Evasion is, in ethics, an act that deceives by stating a true statement that is irrelevant or leads to a false conclusion.
For instance, a man knows that another man is in a room in the building because he heard him, but in answer to a question, says, "I have not seen him," thereby falsely implying that he does not know.
Evasion is described as a way to fulfill an obligation to tell the truth while keeping secrets from those not entitled to know the truth, but is considered unethical[by whom?] unless there are grave reasons for withholding the truth.
Peter Bull identified the following evasion techniques for answering questions: 
- Ignoring the question
- Acknowledging the question without answering it
- Questioning the question by:
- requesting clarification
- reflecting the question back to the questioner, for example saying "you tell me"
- Attacking the question by saying:
- "the question fails to address the important issue"
- "the question is hypothetical or speculative"
- "the question is based on a false premise"
- "the question is factually inaccurate"
- "the question includes a misquotation"
- "the question includes a quotation taken out of context"
- "the question is objectionable"
- "the question is based on a false alternative"
- Attacking the questioner
- Declining to answer by:
- refusing on grounds of inability
- being unwilling to answer
- saying "I can't speak for someone else"
- deferring answer, saying "it is not possible to answer the question for the time being"
- pleading ignorance
- placing the responsibility to answer on someone else
- Bull, Peter The Microanalysis of Political Communication: Claptrap and Ambiguity (2003)