> The problem with laws like this is they're very difficult to prove

Not when the DOJ has subpoena power.

After a Google recruiter reached out to an Apple engineer, Steve Jobs in an email to Eric Schmidt:

    "I would be very pleased if your recruiting department would
    stop doing this,"

Schmidt, forwarding that email to his team:

    "Can you get this stopped and let me know why this is happening?"

Google's Staffing Director:

    "[The recruiter who contacted the Apple Employee] will be terminated within
    the hour."

    "Please extend my apologies as appropriate to Steve Jobs."

http://www.reuters.com/article/2012/01/27/us-apple-lawsuit-i...