No law. Merely widespread uncertainly as to what the SEC plans to do about ICOs and how that will affect the industry. It's a risk that (as a Swiss company) we're not taking, and it's certainly not unusual for blockchain projects to take this path.
The last thing we want to do is end up defending lawsuits in the US or being fined by the SEC. There are far better uses for our investors' money than handing it to lawyers or the US government. As such, we won't be selling EMTQ in the US, nor to anybody under the jurisdiction of the US.
There are ways around this that we can't possibly detect nor prevent, but I'll leave it up to you to figure out what they are.