Damning Testimony has few investigators who want this because of the book requirement in Rogue. Without the Seeker 0-5 Rogue 0-2 Investigator, currently the only people who really want this are Trish, Finn and Alessandra, because they all have 4 book in Rogue, and also all benefit from enemies being alive already. Trish baseline gets an extra clue, Finn likes Evading, and Alessandra wants to Beguile enemies all over the board.

The closest comparison for this is actually Fingerprint Kit, because that is a high cost limited use item that gets you 2 clues in 1 action. The main value here, is that Damning Testimony gives 2 clues in 1 action in Rogue, which is kind of the best clue efficiency Rogue can ever get. Normally we look at Lockpicks or also Thieves Kit. Rogues' main value was getting additional actions to use, but Lockpicks was always once per round. Damning Testimony is also once per round. But the pros?

Pros:

• 2 clues on a success if there is an enemy at a location with a clue (it can be your location as well)
• You only spend evidence if you succeed (unlike Fingerprint kit, so you never lose out value on the autofail)
• Upgradable flexibility
• Illicit so you can dump this in your Underworld Market
• The important parts of Damning Testimony do not care about enemy Elite status.

Cons:

• Once per round
• 4 resource cost which is not nothing in Rogue
• Requires an enemy to be in play. This is important for some scenarios, and so this shouldn't be the only way to get clues.
• Limited uses (not as important when you consider you only spend if you succeed, so the uses always get you an extra clue

While there are 6 upgrades you can take, I personally only think 2 are of serious value, for 4 xp. Blackmail, to get a +2 to the test so you pass, and Fabricated Evidence, so you get 66% more value from your item. for 4 xp then, in the 4 investigators i mentioned, you're testing at 6 to shroud which is a great start to be in and 5 times you can get 2 clues over 5 rounds. This is really good considering its 1 handed, so you can still run something else in the other hand, be it a weapon, or a different item to help investigating such as a lockpicks or a thieves kit. or another Damning Testimony. Damning Testimony also goes up in value for quite a few scenarios if you know them, such as scenarios with patrolling enemies (Fortune and Folly), or chasing enemies (most of the Innsmouth campaign, that infamous train scenario)

Combined with Lockpicks to have something to do with your other 2 actions, I think this is incredible value for XP and Resources. The main problem to overcome is having enemies at the correct locations, which can be a problem to manipulate, but not insurmountable. Rogue now has 2 cards with Bonded enemies they can force into play (Crystalizer of Dreams, and Bianca die Katz). Trish can use Existential Riddle on Hunter enemies so they keep moving. Transmogrify can be used on 1 location to lock an enemy down. Alessandra has Beguile which lets her just move an enemy. Disguise Kit and multiple other effects can lock an enemy down for multiple rounds. But if you're looking to get some clue efficiency in Rogue, I think Damning Testimony is worth the run.

Trish loves this card as it enables all sorts of shenanigans.

Search Warrant: I find this helpful in TCU bit otherwise probably not worth it. Fabricated Evidence: A solid upgrade. Blackmail: Ditto Extort: This allows other rogues to do Trish tricks. Surveil: I only upgrade this if I have extra XP (which never happens in Rogue) Expose: This one is too expensive to be really useful but it is good for removing that annoying cultist on the far side of the map.

My favourite combo with this card is with the .25 Automatic(2) or Dirty Fighting. Remotely evade the enemy and fight it in the same action.

Trish with Damning Testimony is strong. Her ability works amazing with it. Not only will you discover a clue at the location of the chosen enemy, but Trish's ability can have you discover a second clue also, not to mention the clue you discover at your own location. Complete the Surveil ability and you can potentially discover 3 clues at chosen enemy's location. Throw down a Deduction and you're picking up 4 clues [potentially 6 with Deduction (2)]. The +2 (Book) from the Blackmail ability is just icing on the cake. You wouldn't even need to spend the evidence on Damning Testimony with the Surveil ability to discover 2 clues at the enemy's location, making Damning Testimony an unlimited way for Trish to pick up 2 clues a turn, as long as there's an enemy at a location with clues. The only thing that keeps this from being broken is that Damning Testimony exhausts, limiting it to once per turn (unless you're double fisting Damning Testimony).

This is a go to Versatile card for Darrell Simmons. Even better, when he can get it traded by any rogue and|or item supporter like Bob Jenkins or somebody with Untimely Transaction or Teamwork. It's great fun especially with upgrades.