Oops! ... My Bad ... !!!
I thought you'd failed a breathalizer that had malfunctioned ... I didn't absorb the "field sobriety" part ... Stumpy's correct ... A lawyer (free or not) isn't going to be of any use in this situation ...
I carry a card in my billfold that has my mental health conditions listed on it (as well as the phone number(s) of any therapists or p-docs I may be seeing at the time) ... That way if I'm dissociated or having an anxiety or panic attack at least those trying to help me will have a little extra information to work with ...
Of course, if I'm acting so wacky that police have to arrest me, I'll have the good graces to not hold it against them personally because I realize I have some issues that may present me in a strange light, and they're only human and can only deal with what's before them at the time ...
Sincerely,
BrokenCloud