Actually those dogs are trained to smell money as well as drugs.

It was on 'Customs' the Brit version of Border security... last week.

Don't get phased by the £10k figure - it's only a number they have picked out as being a figure above which there might be more involvement with money laundering. You can bring in whatever you like as long as you declare it and can justify it - no country will turn away inbound cash just for fun!

In or out, it seems to make no difference.

I've entered and left the USA and entered Australia with over $60,000 in $US without any problems. I was asked "why so much cash" but so long as you have a good reason to be carrying and your paperwork is in order, then no problem.

I thought is was $10k was per family.

It's just for tracking (money laundering).

They also track money transfers over $10k using Austrac.