I was not there for Carmelita's press conference today. I was there for Mo Farah's earlier in the day.
There were no restrictions on what could be asked with Mo.
I think the only video of Mo's conference is here:
http://youtu.be/bhae0ZYbcBo
There were questions asked to Mo in regards to the positive tests this week. He answered them fine.
As for Jeter, she has a history of refusing to answer questions not about herself. In Lausanne two weeks ago she refused to answer a non-doping question about Usain Bolt. I wrote this about the Lausanne press conference, "a woman asked Jeter and Kimberlyn Duncan what they could learn from Usain Bolt. Duncan gave a nice generic response, and then Jeter said this, "Well right now myself and Kimberlyn Duncan are here so I’d like to pertain only to questions about myself and Kimberlyn Duncan."
http://www.letsrun.com/news/2013/07/felix-sanchez-is-just-like-you-ryan-wilson-never-quit-the-100-vs-hurdles-jeter-montsho-and-more-lausanne/
At the Trials and/or Olympics last year, I remember her being difficult about pretty tame questions not related to her directly.
And then there was the incident at the Olympics last year where I ask her about her association with convicted doper Mark Block after she won bronze at 200. Her response was about as intense as it gets:
http://www.letsrun.com/2012/banned-0809.php
Having said that:
1) Ground rules can be set for interviews.
2) If the journalists don't like the ground rules, I think they should protest beforehand. If the rules are not changed, then I think the journalists should respect the rules or walk out, not try and ask the question.
3) However, if it's announced just prior to the start of the press conference and the journalists don't have time to protest the rules (not sure what happened here), then I think a better course of action would be to directly address to the athlete or manager why it is a legitimate question in the press conference. No need to try and pretend not to ask a doping question. I think the press officer has an obligation to inform the journalists in advance of any restrictions on questions.