On his Twitter page - a social-networking website - Armstrong wrote: "Guess what!? Drug control #10. Unreal."
Many in France still cast a suspicious eye towards Armstrong and the success he achieved before retiring in 2005.
As such, the American is attempting to be as open as possible when it comes to his comeback preparations.
Upon his return, he said: "We're going to be completely transparent. This is for the world to see. I am returning with a completely comprehensive programme and there will be no way to cheat."
The authorities are clearly making sure of this.
Armstrong, though, is hiding nothing, as his postings on Twitter show. They include:
"Ate at Chuys. One of Austin's finest. Had a "big as 'yo face" burrito."
"Got a note from Levi. Was going to go out and train with him but didn't since my condition isn't half-bad now. It's freezing cold there too."
"Still freezing in Austin so training indoors at Kevin's Pedal Hard studio."
"Just saw Slumdog Millionaire. Amazing film. Run don't walk to see it."
"Morning - I'm up drinking coffee, reading the nyt, and texting with Johan who's at the Tour of Spain (Vuelta) presentation."
Former team-mate George Hincapie, however, perhaps seems less than impressed with the media's reaction to Armstrong's return. On his page, he notes: "Just did a USA Today interview. 95 per cent L(ance) A(rmstrong), 5 per cent me. He's back!!!!"Original here