As reported by the Texas Lawyer; see more details here:
"In a perfect world, firms could employ private investigators who are as skilled as pseudo-bumbling television police detective Columbo, Dallas lawyer William Brewer III says.
"That’s rarely the case when Brewer contracts with private investigation companies to help with litigation at 35-lawyer Bickel & Brewer, so the firm launched its own investigative unit in January. It’s staffed by three former agents and a former training instructor with the Federal Bureau of Investigation."