No journalists edits direct quotes like htat - where a person's words or spelling (in a written quote) is idiomatic or incorrect, the practice is to put [sic] after the odd word(s) to signify that they're being reported as received.

If you want to preserve your credibility, it's better to either leave the mistakes in, or explain the context (eg 'this statement was a written record of a verbal statement; we apologize for an inaccuracy in our transcription of Mr. Snowden's recorded words').