Detective Basso is certainly a nasty piece of work, but his actions make sense to me. My reading is this:
A girl he's already pegged as bad news comes speeding down a suburban street in the dark of night and when he pulls her over, mouths off at him like a bratty teenager. This pisses him off so he makes her jump through some hoops - asking about alcohol and making her walk the line even though she doesn't seem drunk. However, when she's walking the line it turns out she's not entirely sober, and then she makes a comment about being drugged. Basso sees this as an attempt to cover but because he's (a) not a nice human being/good cop and (b) pissed off at her for being rude, he goes along with her (to him) obvious untruths in order to get in a bit of mockery. Then he gets bored of tormenting her and finally gives her a ticket.
His closing comment about making the ticket go away if she tells him what happened in the last book is a complete lie - why would that bother him? He just said that on the off chance that she'd tell him while under the influence.
no subject
A girl he's already pegged as bad news comes speeding down a suburban street in the dark of night and when he pulls her over, mouths off at him like a bratty teenager. This pisses him off so he makes her jump through some hoops - asking about alcohol and making her walk the line even though she doesn't seem drunk. However, when she's walking the line it turns out she's not entirely sober, and then she makes a comment about being drugged. Basso sees this as an attempt to cover but because he's (a) not a nice human being/good cop and (b) pissed off at her for being rude, he goes along with her (to him) obvious untruths in order to get in a bit of mockery. Then he gets bored of tormenting her and finally gives her a ticket.
His closing comment about making the ticket go away if she tells him what happened in the last book is a complete lie - why would that bother him? He just said that on the off chance that she'd tell him while under the influence.