Why do suspects NEVER have a lawyer when being questioned?!

Rewatching for the first time inyears. Just starting season 2.

Maybe it changes as the series goes on, I can’t remember. But suspects NEVER have lawyers when being questioned. Legal counsel can be the difference between walking out the station scot free or being charged and chucked in prison until the trial (in the UK it’s called remand).

I have noticed this in other US shows, is it normal? We get free legal aid, if that’s not case across the pond then maybe that explains it. But here people know - even if you’re innocent - ALWAYS get a lawyer (solicitor we call em).