What do you think is a safe Nursing/patient ratio?

What do you think is a safe Nursing/patient ratio?  Does this depend on what specialty or location you are in?  Should it?  California has worked hard to get established nurse/patient ratios assigned by law and in 2008 telemetry and other specialties are to have a 1:4 nursing:patient ratio.  Should other states work hard at adapting similar laws and guidelines?   What about long-term care and nursing homes?

 
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