<human>: I've been waiting to hear from this firm for 3 weeks.  I've had three great interviews, where the final one they flew me in and talked to me for the full day.  I left with a great impression and thought I did very well.  My impression is I'm the only candidate.

After two weeks, I asked for an update, and got a response saying they've been quite busy and have had no time to talk, that the following week (this week) would be better.  

I would normally give them more time, but I'm facing some third-party, pressure (S.O. visa issues) to decide where to live soon, either where I am now or relocate to where this job would be.

I do not want to follow up again this soon, nor do I want to say that I need to decide because of the aforementioned issue for fear of looking desperate or somehow forgoing salary seeing as how my decision on where to live depends on them.  

Would it be kosher to say I have a job offer to put some pressure on them to get their act together?  I've heard that some potential employers could ask to see proof, while I've also heard that they do not have the right to ask/see proof.

Give me a shortened version of the text
<bot>: Potential employer taking a while to make a hiring decision, should I fake a job offer to light a fire under their ass?