tamper with，做手脚，擅自篡改

cab

案件侦破里，经常发现这个说法，证物，汽车或者是别的东西被人动过手脚了，应该怎么英语翻译才地道呢？先看下面两个例句，先猜一猜怎么解释。
Someone tampered with the lock.
The evidence has been tampered with.

tamper

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tam∙per / ˈtæmpə ; ˈtæmpə /
◙verb【PHR V】
◘tamper with sth
• to touch something or make changes to it without permission, especially in order to deliberately damage it
• 胡乱摆弄; 擅自篡改〔尤指为了故意损坏〕:
»He noticed that the instruments had been tampered with.
  他注意到仪器被人动过了。
»I don't see the point in tampering with a system that's worked fine so far.
  我不明白一个系统运行得好好的，改它干吗。


PHRASAL VERBS
▪ 'tamper with sth
   to make changes to sth without permission, especially in order to damage it
   篡改,擅自改动,胡乱摆弄(尤指有意破坏)
SYN   interfere with :
   Someone had obviously tampered with the brakes of my car.
   显然有人鼓捣过我汽车的刹车。

tamper
I. tam·per \ˈtampə(r), -aam-, -aim-\ verb
(tampered ; tampered ; tampering \-p(ə)riŋ\ ; tampers)
Etymology: probably from Middle French temprer to mix, meddle, blend, temper — more at temper
intransitive verb
1. : to deal secretly : carry on underhand or improper negotiations : bring improper influence to bear (as by bribery or intimidation) — used with with
< charged that the defense attorney had tampered with the witnesses >
2.
a. : to interfere so as to weaken or change for the worse — used with with
  < as old customers themselves, they would not tamper with the place's traditions or staff — Newsweek >
  < could not easily tamper with the privileges of the nobility — D.W.Brogan >
b. : to busy oneself rashly : try foolish or dangerous experiments — used with with
  < is far from innocent in her own tampering with his sensibilities — James Gray >
3. archaic : to work secretly for some end : plot, scheme
transitive verb
: to alter for an improper purpose or in an improper way
< here, perhaps, is the most objectionable aspect of … tampering the texts: his bland presumption — Richard Hanser >
Synonyms: see meddle
II. tamp·er noun
(-s)
Etymology: tamp (I) + -er
: one that tamps: as
a. : one that prepares for blasting by filling the hole in which the charge has been placed
b. : a round wooden stick or metal bar used to pack tamping in a drill hole
c. : a tool or machine for compacting concrete by tamping
d. : a mass of material used to delay a nuclear reaction and prevent the escape of neutrons