Quote from trefoil:
For me, that's always been the whole point of technical analysis. You get signals that something is happening long before the news comes out.
Still, insider trading as defined in the statutes is a crime. It's separate and distinct from an inside person selling within the defined parameters of when they are allowed to do so based on observation and knowledge of the workings of the company. What the statutes define as insider trading is someone knowing, for instance, about an imminent deal as a result of his job and trading on that knowledge. Such a person needs to be jailed.
For the purposes of T/A, such a person is not necessary: all that's necessary is inside folks who have everyday knowledge of the company and buy or sell based on that knowledge. Thieves aren't necessary to the workings of T/A, which may have been this person's argument.
I don't think the technical analysis signals would apply if insider trading were legalized. The "edge" you see in TA assumes that market participants are trading the way they do in the current market environment.. But if insider trading were legalized, I think you'd see more like an immediate price spike or immediate price drop when material information becomes known to the insider. The CEO, CFO, accountants, auditor, IT guys etc. would all be backed by multi-billion dollar hedge funds who are trying to outrace each other to the information. Corporate officers would no longer focus on their real jobs.. they'd basically spend all their time trying to get information for trading purposes. If there are any inefficiencies in the market, they don't stay inefficient for long.