Anything newly acquired should be tested for curses. Unfortunately, often the best way to detect a cursed item is to try using it. And once used, naturally you can't get rid of a cursed item. That's why it's called cursed.

Given the number of cursed items lying around in your typical fantasy campaign world, there must be approximately one cursed item for every dozen or so useful magic items. Who's making all these things? Where is the quality control on magic item production? This would be like going to your local Freecycle centre or garage sale, picking up a bicycle, a lamp, a toaster oven, a pair of candlesticks, and a stack of old vinyl LPs, and then later when you make a grilled cheese sandwich you suddenly discover that your sex has been changed.

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Anakin: During the night, I get up and go out to the balcony.
Padmé: Annie, are you okay?
Anakin: I remember when I gave this to you.
Padmé: What?
Anakin: The Japor snippet. To bring you good luck.
Padmé: Ah. Maybe it's magic. But I haven't noticed any luck.
Anakin: I just had a nightmare.
Padmé: We should get this thing tested.
Anakin: About you.
Padmé: Obi-Wan can probably do a Detect on it.
Anakin: You die in childbirth.
Padmé: It could be a talisman.
Anakin: Are you even listening to me?
Padmé: Of course!
Padmé: Let me try removing it. It could be a cursed talisman.