A family law attorney agreed with my suggestions about how you can tell if your partner is cheating. We didn't overlap in our approaches to much else when it comes to infidelity, because let's face it, by the time you're scheduling with a lawyer, you may be past the point of counseling. Potential signs of cheating include sudden changes in behavior, spending extra time on the computer or texing, hiding one's phone or turning away from partner while on phone, or suddenly having passwords on phones or computers. Certainly there are other potential signs, but these are the ones that are most recent in the last 5 years or so with the increase in contact available through technology.
Watch the entire "Legally Speaking" episode on the topic of Cheating Spouses & Infidelity where lawyers Tina Willis and Stephan Futeral inteview Christopher Pearsall and myself. It's interesting to hear the law perspective on this topic (e.g., tracking devices on cars)!