The magistrate judge present at the bedside arraignment later advised Mr Tsarnaev of his rights and of the charges against him.
At the arraignment last night, Ms. Lowery's lawyer, Gilbert Parris, said that he was not present when she was questioned, "clearly a breach of my representation of her".
Mayweather, who coached his nephew Floyd Mayweather Jr. to victory in a September comeback fight against Juan Manuel Marquez, did not appear or have a lawyer present at a felony arraignment in Las Vegas Justice Court.
Also at the arraignment was the baby's father, Joseph Amoroso.
At the arraignment, the prosecutor, Nicole Blumberg, offered more details.
The disclosures came at the arraignment of the dealer, Glafira Rosales, in United States District Court in Manhattan.
"They're never available at the arraignment," she said.
At the arraignment, Mr. Laffer's lawyer, Mary-Elizabeth Abbate, entered a plea of not guilty on his behalf.
The guards appeared at the arraignment on Tuesday, along with their lawyers, and bail was set at $25,000 for each.
At the arraignment on Wednesday, the prosecutor, Samantha Turino, described the detective as "an active participant" in the attack.
