That's the norm, but sometimes it isn't even that formal, for instance at a deposition.

My youngest daughter was going through a phase of some sort. She was living in NC at the time and was a victim of false identification. She was all beat up by a women that took her for someone else.
She was living with family members who supported her in this case and called me most every hour to let me know how the court case was going.
This case had taken almost a year to get to court, wheels of justice turn slowly.
When it came time for my daughter to be sworn in it caused a problem for the small town southern court not to mention her siblings. She refused to swear on the Bible.
Now she went to church every Sunday, a Southern Baptist from the North and the only white person in the church. She like the rest of my family found the sounds of the South were much closer to the spirit then the darn slowly dirges the white Christian churches sang. Example is the Saints Come Marching In==== between Rock of Ages.
Ever Listen to of all people Elvis sing gospel, darn this an experience in faith, as are all little churches today that understand to that to make a joy full noise unto the Lord is important. For the people who do this and those that hear it or even for the deaf the words to the music and the effect on the hearing is delight full.
So to get back to my daughter that refused to swear on a Bible against a stranger that cold cocked her by mistake.
Never did find out why or how she did this, Today she is a Grandmother, still sings in the Black Churches with the baby on her hip. Up here in the North, and yes friends and family do not understand her, never married but who is to question that.