Is there a way to tell whether they made a straight?

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2. There is no need to make a pot bet on the turn. If he is on a draw, a bet of .40 is enough to make his call incorrect.

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I think potting the turn in NL5 makes you more money in the long run. They are calling pot-sized turn bets with top pair, any draw (even a lot of gutshots), and even two overs. They do it constantly. I think you may leave money on the table by betting less than the pot on the turn versus most NL5 players.

Of course, you should be observing the players and figuring out how much to be versus each one, but my default line would be to pot it here, too.