Monday's hearing was supposed to be the first step to determine who would pay for jail reforms.
Now that a judge has ruled that jail conditions are unconstitutional, the question is how to pay for it.
Gusman says he signed the consent decree after the city refused his 2013 request for an extra $15 million.
Deputy mayor and judge clash over whether the city was included in consent decree negotiations.
Jail security is a study in "total dysfunction," testified expert witness Manuel Romero.
On Wednesday, testimony concerned the city's involvement in the negotiations over the consent decree and conditions in the mental health unit. Sheriff Marlin Gusman will testify Thursday morning.
Gusman disputes $22 million-a-year for five years, cited by mayor.
Mayor Landrieu will paint a grim picture of financial impacts if city is forced to cover costs of the federal consent decree.