The loadlifter and the mentats cards both instruct you to exhaust the card to gain the effect. My question is whether or not this exhaust is mandatory or can you choose when to use it?

Like, if there an S test, do I have to exhaust my loadlifter or can I choose not to on this test? I ask because some cards say 'may use' but these ones don't.

Definitely optional. You only exhaust them when you're in a pinch, because unexhausting them is difficult, risky, and time-consuming.

Thank you. That is what I thought and how I've been playing it. I guess I was confused becauae some cards say may and some don't and it made me wonder why they just didn't use 'may' across the board. Again, thank you.