Am Law 100 firm Locke Lord and a Dallas partner are facing a $30 million lawsuit by a former client who alleges the firm breached its duties in an underlying case where the client lost a $340 million verdict on appeal.

Retractable Technologies Inc., a Denton County-based medical device company, hired Locke Lord and partner Roy Hardin for representation in disputes with a competitor, according to the Nov. 7 original petition in Retractable Technologies v. Locke Lord.