2 sentences

1. 刑警正在现场调查取证。

   xíng​jǐng zhèng​zài xiàn​chǎng diào​chá qǔ​zhèng.

   The criminal police are investigating and collecting evidence at the scene.

   Source: Dong Chinese Dictionary

2. 警方正在案发现场进行取证。

   jǐng​fāng zhèng​zài àn​fā xiàn​chǎng jìn​xíng qǔ​zhèng.

   The police are gathering evidence at the crime scene.

   Source: Dong Chinese Dictionary