Do they convict based on a breathalyser reading alone in the US? I'm fairly sure that in my country/state, the breathalyser can only provide probable cause for

Do they convict based on a breathalyser reading alone in the US? I'm fairly sure that in my country/state, the breathalyser can only provide probable cause for them to do a blood test. Also, how could sniffer dogs provide evidence for court? Surely they couldn't convict without actually finding drugs?