Check this out!
Just doing a search on maternity clothes and came across this - http://www.milkscreen.com.au/.
Its like a pregnancy test so its a strip, you put breast milk on it and it will show positive for alcohol in your breast milk or negative.
The byline is:
"Milkscreen is a simple 2 minute test to detect alcohol in breast milk, allowing mums to safely breastfeed their baby and to resume their pre-baby lifestyle guilt-free. It encourages women to breastfeed longer, with them confident in the knowledge they are not harming their baby even when they relax with a glass of wine with friends!"
Technology eh? What else can they test for???
And would you use it?