What info do you need . The police have been doing raids on these places for years now. They come in arrest the clerk & owner & give citations for class C misdemeanors to the customers and take every ones money. Some even get there car impounded.
Let's start with this: Texas Penal Code (TPC) § 47.02 states:
Sec. 47.02. GAMBLING. (a) A person commits an offense if he:
(1) makes a bet on the partial or final result of a game or contest or on the performance of a participant in a game or contest;
(2) makes a bet on the result of any political nomination, appointment, or election or on the degree of success of any nominee, appointee, or candidate; or
(3) plays and bets for money or other thing of value at any game played with cards, dice, balls, or any other gambling device.
A violation of this section is a class C misdemeanor offense. A bet is defined in the law as "an agreement to win or lose something of value solely or partially by chance." TPC § 47.01(1). And a gambling device is defined as:
any electronic, electromechanical, or mechanical contrivance not excluded under Paragraph (B) that for a consideration affords the player an opportunity to obtain anything of value, the award of which is determined solely or partially by chance, even though accompanied by some skill, whether or not the prize is automatically paid by the contrivance. The term:
(A) includes, but is not limited to, gambling device versions of bingo, keno, blackjack, lottery, roulette, video poker, or similar electronic, electromechanical, or mechanical games, or facsimiles thereof, that operate by chance or partially so, that as a result of the play or operation of the game award credits or free games, and that record the number of free games or credits so awarded and the cancellation or removal of the free games or credits; and
(B) does not include any electronic, electromechanical, or mechanical contrivance designed, made, and adapted solely for bona fide amusement purposes if the contrivance rewards the player exclusively with noncash merchandise prizes, toys, or novelties, or a representation of value redeemable for those items, that have a wholesale value available from a single play of the game or device of not more than 10 times the amount charged to play the game or device once or $5, whichever is less.
TPC § 47.01(4). Thus if you are betting anything of value using a keno, video poker, slot machine, or any other machine in which your chance to win a prize is determined solely or partially by chance you are engaging in illegal gambling other than the exception for amusement devices that you see in paragraph (B). The persons who run the gaming rooms also commit an offense, a class A misdemeanor.
What this means is that if you are in a gaming room when the police come in and raid it, you may well get cited for illegal gambling and the owners and promoters of the gaming room are going to end up cited for their role in it, too.
As for the seizure of cash, I see two possibilities. One is that the cash is seized as evidence. The other is that cops seize thinking that they can do that under the state civil forfeiture law, although gambling offenses are not among the listed offenses that would allow for civil forfeiture. Either way, it may take suing the police or prosecutor to get the property back.