The Jesus Freaks Will Hate This

[Huggy Bear]

Really?

Wowee.

You realise that in your example both negatives refer to the speaker, and in Steel's answer only of them did that, don't you? Here, I'll underline it for you:

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"I am not intimating that I did not steal it"

I am not intimating that a planetary body cannot shift its orbit.

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http://www.grammar-monster.com/glossary/...gative.htm

What Are Double Negatives? (with Examples)
A double negative is usually produced by combining the negative form of verb (e.g., cannot, did not, have not) with a negative pronoun (e.g., nothing, nobody), a negative adverb(e.g., never, hardly) or a negative conjunction (e.g., neither/nor).

"not" is a negative adverb, "cannot" is a negative verb.
Both were used in the same sentence.
http://en.wikipedia.org/wiki/Double_negative

A double negative occurs when two forms of negation are used in the same sentence.