Honestly, if you bring this into a government area, then you will probably get shot on sight if you are seen by security. To be safer and a little bit more stealthy, maybe try disguising it as a soda can or a door stop.
The android app for rooted phones is a great idea though. That's much easier to run in promiscuous mode and sneak past everybody.
Clearly, some things are off limits for art exhibits.
How much judicial process a person would get, and whether the person with the transparency grenade would be killed with or without judicial process, would indeed vary from one government to another. But it would be a rare government that would forget about searching people thought to have grenades with them in secure areas as a CONSISTENT practice. (Counterexamples to what I just wrote: A confidant of Hitler was able to bring a briefcase containing a bomb into a meeting with Hitler.
http://news.bbc.co.uk/onthisday/hi/dates/stories/july/20/new...
A group of CIA operatives were assassinated by a person they believed to be an informant, who was actually a Taliban double agent.
http://online.wsj.com/article/SB126225941186711671.html
So maybe someone attempting to penetrate a secure area, especially a trusted person, might get lucky bringing in a transparency grenade, even in the artist's intentionally provocative form. But in the general case, it is probably wiser to use better tradecraft and disguise the spying device as something harmless that belongs in the secure area.)
The more serious suggestion in the page submitted here is that perhaps we can all live a little more freely if only we can find out what is being deliberated by the most secretive regimes, the regimes from whose territories we most rarely see posts on Hacker News.
http://en.wikipedia.org/wiki/Ahmed_Shah_Massoud#Assassinatio...