I came across this paper which I found interesting.
http://www.wrap.org.uk/downloads/Clopyralid_report_FINAL.2fe810e3.9966.pdf
I seems to suggest that growing Red Clover will show problems in 14 days.  Which I think is rather more speedy than the bean tests.
Has anyone any experience of the affects on Red Clover?    I might give it a whirl.
I have been using quite a lot of recycled compost and I am concerned about it.  A 14 day test might be very welcome.
			
			
			
				There are details instructions for testing with red clover on this site
http://www.recycledorganics.com/infosheets/rmtools/RMtools.pdf
Gives a good list of susceptible plant for clopyralid but unfortunately not for aminopyralid.
			
			
			
				I posted this rather late I think everyone had gone to bed.