The original charges against Ulbricht, as well as his defense attorney's responses, both include this kind of "I am an expert" language. This is most likely a convention of legal writing, not technical writing.
Not quite, Silk Road document is using very neutral and "objective" kind of speech, c.f. "Based on my training and experience, Silk Road has emerged as the most sophisticated and extensive criminal marketplace on the Internet today." [0]
