Consultant, Attorney, and Translator
Foreign language skills are always a plus in that they reflect adventurousness, adaptability, and willingess to communicate outside of your comfort zone. In that sense, French won't likely ever diminish your hirability. That said, looking at the practicality and your chosen career, it may not be the most useful choice. If you're planning on staying in the USA, then Spanish would be more applicable. If you think you might end up overseas, say with an international group like Interpol, French would be good because it is widely spoken throughout the world. Either way, go with your true interests. You could even take both French and Spanish, which isn't too tall of an order given that they're from the same language family. Best of luck - whichever language you take, you won't be disappointed!